RISC-V: Select SYSCON Reboot and Poweroff for QEMU virt machine

The SYSCON Reboot and Poweroff drivers can be used on QEMU virt machine
to reboot or poweroff the system hence we select these drivers using
QEMU virt machine kconfig option.
Signed-off-by: NAnup Patel <anup.patel@wdc.com>
Reviewed-by: NPalmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/Kconfig.socs

@@ -26,6 +26,8 @@ config SOC_VIRT
        select RPMSG_VIRTIO
        select CRYPTO_DEV_VIRTIO
        select VIRTIO_INPUT
+       select POWER_RESET_SYSCON
+       select POWER_RESET_SYSCON_POWEROFF
        select SIFIVE_PLIC
        help
          This enables support for QEMU Virt Machine.

arch/riscv/configs/defconfig

@@ -58,6 +58,7 @@ CONFIG_HW_RANDOM=y
 CONFIG_SPI=y
 CONFIG_SPI_SIFIVE=y
 # CONFIG_PTP_1588_CLOCK is not set
+CONFIG_POWER_RESET=y
 CONFIG_DRM=y
 CONFIG_DRM_RADEON=y
 CONFIG_FRAMEBUFFER_CONSOLE=y

arch/riscv/configs/rv32_defconfig

@@ -56,6 +56,7 @@ CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
 CONFIG_HVC_RISCV_SBI=y
 CONFIG_HW_RANDOM=y
 # CONFIG_PTP_1588_CLOCK is not set
+CONFIG_POWER_RESET=y
 CONFIG_DRM=y
 CONFIG_DRM_RADEON=y
 CONFIG_FRAMEBUFFER_CONSOLE=y