ARM: imxrt_defconfig: Add i.MXRT family defconfig

Add generic i.MXRT family defconfig.
Signed-off-by: NGiulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: NJesse Taube <Mr.Bossman075@gmail.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/configs/imxrt_defconfig

+# CONFIG_LOCALVERSION_AUTO is not set
+CONFIG_BPF_SYSCALL=y
+CONFIG_SCHED_AUTOGROUP=y
+# CONFIG_MMU is not set
+CONFIG_ARCH_MXC=y
+CONFIG_SOC_IMXRT=y
+CONFIG_SET_MEM_PARAM=y
+CONFIG_DRAM_BASE=0x80000000
+CONFIG_DRAM_SIZE=0x02000000
+CONFIG_BINFMT_FLAT=y
+CONFIG_UEVENT_HELPER=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_IMX_WEIM=y
+CONFIG_LEGACY_PTY_COUNT=2
+CONFIG_SERIAL_FSL_LPUART=y
+CONFIG_SERIAL_FSL_LPUART_CONSOLE=y
+CONFIG_SERIAL_DEV_BUS=y
+CONFIG_PINCTRL_IMXRT1050=y
+CONFIG_GPIO_MXC=y
+CONFIG_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_PLTFM=y
+CONFIG_MMC_SDHCI_ESDHC_IMX=y
+CONFIG_DMADEVICES=y
+CONFIG_FSL_EDMA=y
+CONFIG_CLK_IMXRT1050=y
+CONFIG_EXT4_FS=y
+CONFIG_EXT4_FS_POSIX_ACL=y
+CONFIG_EXT4_FS_SECURITY=y
+CONFIG_VFAT_FS=y
+CONFIG_FAT_DEFAULT_UTF8=y
+CONFIG_EXFAT_FS=y
+CONFIG_NLS_ASCII=y
+CONFIG_NLS_UTF8=y