powerpc/configs: Add Skiroot defconfig

This configuration is used by the OpenPower firmware for it's
Linux-as-bootloader implementation. Also known as the Petitboot
kernel, this configuration broke in 4.12 (CPU_HOTPLUG=n), so add it to
the upstream tree in order to get better coverage.
Signed-off-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/configs/skiroot_defconfig

+CONFIG_PPC64=y
+CONFIG_ALTIVEC=y
+CONFIG_VSX=y
+CONFIG_NR_CPUS=2048
+CONFIG_CPU_LITTLE_ENDIAN=y
+# CONFIG_SWAP is not set
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+# CONFIG_CROSS_MEMORY_ATTACH is not set
+CONFIG_NO_HZ=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_TASKSTATS=y
+CONFIG_TASK_DELAY_ACCT=y
+CONFIG_TASK_XACCT=y
+CONFIG_TASK_IO_ACCOUNTING=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_LOG_BUF_SHIFT=20
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+# CONFIG_RD_GZIP is not set
+# CONFIG_RD_BZIP2 is not set
+# CONFIG_RD_LZMA is not set
+# CONFIG_RD_LZO is not set
+# CONFIG_RD_LZ4 is not set
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_PERF_EVENTS=y
+# CONFIG_COMPAT_BRK is not set
+CONFIG_JUMP_LABEL=y
+CONFIG_STRICT_KERNEL_RWX=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_MODULE_SIG=y
+CONFIG_MODULE_SIG_FORCE=y
+CONFIG_MODULE_SIG_SHA512=y
+CONFIG_PARTITION_ADVANCED=y
+# CONFIG_IOSCHED_DEADLINE is not set
+# CONFIG_PPC_PSERIES is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+CONFIG_CPU_IDLE=y
+CONFIG_HZ_100=y
+CONFIG_KEXEC=y
+CONFIG_IRQ_ALL_CPUS=y
+CONFIG_NUMA=y
+# CONFIG_COMPACTION is not set
+# CONFIG_MIGRATION is not set
+# CONFIG_BOUNCE is not set
+CONFIG_PPC_64K_PAGES=y
+CONFIG_SCHED_SMT=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE="console=tty0 console=hvc0 powersave=off"
+# CONFIG_SECCOMP is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_MULTICAST=y
+CONFIG_NET_IPIP=y
+CONFIG_SYN_COOKIES=y
+# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
+# CONFIG_INET_XFRM_MODE_TUNNEL is not set
+# CONFIG_INET_XFRM_MODE_BEET is not set
+# CONFIG_IPV6 is not set
+CONFIG_DNS_RESOLVER=y
+# CONFIG_WIRELESS is not set
+CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_MTD=m
+CONFIG_MTD_POWERNV_FLASH=m
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_BLK_DEV_RAM_SIZE=65536
+CONFIG_VIRTIO_BLK=m
+CONFIG_BLK_DEV_NVME=m
+CONFIG_EEPROM_AT24=y
+# CONFIG_CXL is not set
+CONFIG_BLK_DEV_SD=m
+CONFIG_BLK_DEV_SR=m
+CONFIG_BLK_DEV_SR_VENDOR=y
+CONFIG_CHR_DEV_SG=m
+CONFIG_SCSI_CONSTANTS=y
+CONFIG_SCSI_SCAN_ASYNC=y
+CONFIG_SCSI_FC_ATTRS=y
+CONFIG_SCSI_CXGB3_ISCSI=m
+CONFIG_SCSI_CXGB4_ISCSI=m
+CONFIG_SCSI_BNX2_ISCSI=m
+CONFIG_BE2ISCSI=m
+CONFIG_SCSI_AACRAID=m
+CONFIG_MEGARAID_NEWGEN=y
+CONFIG_MEGARAID_MM=m
+CONFIG_MEGARAID_MAILBOX=m
+CONFIG_MEGARAID_SAS=m
+CONFIG_SCSI_MPT2SAS=m
+CONFIG_SCSI_IPR=m
+# CONFIG_SCSI_IPR_TRACE is not set
+# CONFIG_SCSI_IPR_DUMP is not set
+CONFIG_SCSI_QLA_FC=m
+CONFIG_SCSI_QLA_ISCSI=m
+CONFIG_SCSI_LPFC=m
+CONFIG_SCSI_VIRTIO=m
+CONFIG_SCSI_DH=y
+CONFIG_SCSI_DH_ALUA=m
+CONFIG_ATA=y
+CONFIG_SATA_AHCI=y
+# CONFIG_ATA_SFF is not set
+CONFIG_MD=y
+CONFIG_BLK_DEV_MD=m
+CONFIG_MD_LINEAR=m
+CONFIG_MD_RAID0=m
+CONFIG_MD_RAID1=m
+CONFIG_MD_RAID10=m
+CONFIG_MD_RAID456=m
+CONFIG_MD_MULTIPATH=m
+CONFIG_MD_FAULTY=m
+CONFIG_BLK_DEV_DM=m
+CONFIG_DM_CRYPT=m
+CONFIG_DM_SNAPSHOT=m
+CONFIG_DM_MIRROR=m
+CONFIG_DM_ZERO=m
+CONFIG_DM_MULTIPATH=m
+CONFIG_ACENIC=m
+CONFIG_ACENIC_OMIT_TIGON_I=y
+CONFIG_TIGON3=y
+CONFIG_BNX2X=m
+CONFIG_CHELSIO_T1=y
+CONFIG_BE2NET=m
+CONFIG_S2IO=m
+CONFIG_E100=m
+CONFIG_E1000=m
+CONFIG_E1000E=m
+CONFIG_IXGB=m
+CONFIG_IXGBE=m
+CONFIG_MLX4_EN=m
+CONFIG_MLX5_CORE=m
+CONFIG_MLX5_CORE_EN=y
+CONFIG_MYRI10GE=m
+CONFIG_QLGE=m
+CONFIG_NETXEN_NIC=m
+CONFIG_SFC=m
+# CONFIG_USB_NET_DRIVERS is not set
+# CONFIG_WLAN is not set
+CONFIG_INPUT_EVDEV=y
+CONFIG_INPUT_MISC=y
+# CONFIG_SERIO_SERPORT is not set
+# CONFIG_DEVMEM is not set
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_IPMI_HANDLER=y
+CONFIG_IPMI_DEVICE_INTERFACE=y
+CONFIG_IPMI_POWERNV=y
+CONFIG_HW_RANDOM=y
+CONFIG_TCG_TIS_I2C_NUVOTON=y
+# CONFIG_I2C_COMPAT is not set
+CONFIG_I2C_CHARDEV=y
+# CONFIG_I2C_HELPER_AUTO is not set
+CONFIG_DRM=y
+CONFIG_DRM_RADEON=y
+CONFIG_DRM_AST=m
+CONFIG_FIRMWARE_EDID=y
+CONFIG_FB_MODE_HELPERS=y
+CONFIG_FB_OF=y
+CONFIG_FB_MATROX=y
+CONFIG_FB_MATROX_MILLENIUM=y
+CONFIG_FB_MATROX_MYSTIQUE=y
+CONFIG_FB_MATROX_G=y
+# CONFIG_LCD_CLASS_DEVICE is not set
+# CONFIG_BACKLIGHT_GENERIC is not set
+# CONFIG_VGA_CONSOLE is not set
+CONFIG_LOGO=y
+# CONFIG_LOGO_LINUX_MONO is not set
+# CONFIG_LOGO_LINUX_VGA16 is not set
+CONFIG_USB_HIDDEV=y
+CONFIG_USB=y
+CONFIG_USB_MON=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_EHCI_HCD=y
+# CONFIG_USB_EHCI_HCD_PPC_OF is not set
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_GENERIC=m
+CONFIG_VIRT_DRIVERS=y
+CONFIG_VIRTIO_PCI=y
+# CONFIG_IOMMU_SUPPORT is not set
+CONFIG_EXT4_FS=m
+CONFIG_EXT4_FS_POSIX_ACL=y
+CONFIG_EXT4_FS_SECURITY=y
+CONFIG_XFS_FS=m
+CONFIG_XFS_POSIX_ACL=y
+CONFIG_BTRFS_FS=m
+CONFIG_BTRFS_FS_POSIX_ACL=y
+CONFIG_ISO9660_FS=m
+CONFIG_UDF_FS=m
+CONFIG_MSDOS_FS=m
+CONFIG_VFAT_FS=m
+CONFIG_PROC_KCORE=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+# CONFIG_MISC_FILESYSTEMS is not set
+# CONFIG_NETWORK_FILESYSTEMS is not set
+CONFIG_NLS_DEFAULT="utf8"
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ASCII=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_NLS_UTF8=y
+CONFIG_CRC16=y
+CONFIG_CRC_ITU_T=y
+CONFIG_LIBCRC32C=y
+CONFIG_PRINTK_TIME=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_KERNEL=y
+CONFIG_DEBUG_STACKOVERFLOW=y
+CONFIG_SOFTLOCKUP_DETECTOR=y
+CONFIG_HARDLOCKUP_DETECTOR=y
+CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=y
+CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC=y
+CONFIG_WQ_WATCHDOG=y
+CONFIG_SCHEDSTATS=y
+# CONFIG_FTRACE is not set
+CONFIG_XMON=y
+CONFIG_XMON_DEFAULT=y
+CONFIG_SECURITY=y
+CONFIG_IMA=y
+CONFIG_EVM=y
+# CONFIG_CRYPTO_ECHAINIV is not set
+CONFIG_CRYPTO_ECB=y
+CONFIG_CRYPTO_CMAC=y
+CONFIG_CRYPTO_MD4=y
+CONFIG_CRYPTO_ARC4=y
+CONFIG_CRYPTO_DES=y
+# CONFIG_CRYPTO_HW is not set