RISC-V: Select Goldfish RTC driver for QEMU virt machine

We select Goldfish RTC driver using QEMU virt machine kconfig option
to access RTC device on QEMU virt machine.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/Kconfig.socs

@@ -28,6 +28,8 @@ config SOC_VIRT
        select VIRTIO_INPUT
        select POWER_RESET_SYSCON
        select POWER_RESET_SYSCON_POWEROFF
+       select GOLDFISH
+       select RTC_DRV_GOLDFISH
        select SIFIVE_PLIC
        help
          This enables support for QEMU Virt Machine.

arch/riscv/configs/defconfig

@@ -73,6 +73,7 @@ CONFIG_USB_STORAGE=y
 CONFIG_USB_UAS=y
 CONFIG_MMC=y
 CONFIG_MMC_SPI=y
+CONFIG_RTC_CLASS=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_AUTOFS4_FS=y

arch/riscv/configs/rv32_defconfig

@@ -69,6 +69,7 @@ CONFIG_USB_OHCI_HCD=y
 CONFIG_USB_OHCI_HCD_PLATFORM=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_UAS=y
+CONFIG_RTC_CLASS=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y
 CONFIG_AUTOFS4_FS=y