riscv: Fix unmet direct dependencies built based on SOC_VIRT

Fix unmet direct dependencies Warning and fix Kconfig indent.

WARNING: unmet direct dependencies detected for POWER_RESET_SYSCON
  Depends on [n]: POWER_RESET [=n] && OF [=y] && HAS_IOMEM [=y]
  Selected by [y]:
  - SOC_VIRT [=y]

WARNING: unmet direct dependencies detected for POWER_RESET_SYSCON_POWEROFF
  Depends on [n]: POWER_RESET [=n] && OF [=y] && HAS_IOMEM [=y]
  Selected by [y]:
  - SOC_VIRT [=y]

WARNING: unmet direct dependencies detected for RTC_DRV_GOLDFISH
  Depends on [n]: RTC_CLASS [=n] && OF [=y] && HAS_IOMEM [=y] && (GOLDFISH [=y] || COMPILE_TEST [=n])
  Selected by [y]:
  - SOC_VIRT [=y]
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/Kconfig.socs

@@ -11,14 +11,15 @@ config SOC_SIFIVE
 	  This enables support for SiFive SoC platform hardware.
 
 config SOC_VIRT
-       bool "QEMU Virt Machine"
-       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.
+	bool "QEMU Virt Machine"
+	select POWER_RESET
+	select POWER_RESET_SYSCON
+	select POWER_RESET_SYSCON_POWEROFF
+	select GOLDFISH
+	select RTC_DRV_GOLDFISH if RTC_CLASS
+	select SIFIVE_PLIC
+	help
+	  This enables support for QEMU Virt Machine.
 
 config SOC_KENDRYTE
 	bool "Kendryte K210 SoC"