configs: e850-96: Enable more EFI features

The basic EFI support is already enabled by EFI_LOADER. Follow
SystemReady IR recommendations [1,2] for U-Boot and enable support for
more EFI features. That includes:

  - CONFIG_CMD_BOOTEFI_SELFTEST: support for "bootefi selftest" command
  - CONFIG_CMD_NVEDIT_EFI: support for "env -e" to explore EFI vars
  - CONFIG_CMD_EFIDEBUG: support for "efidebug" command

Also enable RTC support:

  - CONFIG_EFI_SET_TIME
  - CONFIG_CMD_RTC
  - CONFIG_DM_RTC
  - CONFIG_RTC_EMULATION

[1] https://developer.arm.com/documentation/DUI1101/1-1/Configure-U-Boot-for-SystemReady
[2] https://developer.arm.com/documentation/DUI1101/1-1/Test-SystemReady-IR

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

configs/e850-96_defconfig

@@ -14,16 +14,22 @@ CONFIG_DEFAULT_DEVICE_TREE="exynos/exynos850-e850-96"
 CONFIG_SYS_LOAD_ADDR=0x80000000
 CONFIG_ENV_OFFSET_REDUND=0x10000
 # CONFIG_PSCI_RESET is not set
+CONFIG_EFI_SET_TIME=y
 CONFIG_ANDROID_BOOT_IMAGE=y
 # CONFIG_AUTOBOOT is not set
 CONFIG_DEFAULT_FDT_FILE="exynos850-e850-96.dtb"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_HUSH_PARSER=y
+CONFIG_CMD_BOOTEFI_SELFTEST=y
 CONFIG_CMD_ABOOTIMG=y
+CONFIG_CMD_NVEDIT_EFI=y
 CONFIG_CMD_CLK=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_PART=y
+CONFIG_CMD_EFIDEBUG=y
+# CONFIG_CMD_DATE is not set
+CONFIG_CMD_RTC=y
 CONFIG_CMD_TIME=y
 CONFIG_CMD_RNG=y
 CONFIG_PARTITION_TYPE_GUID=y
@@ -36,6 +42,8 @@ CONFIG_NO_NET=y
 CONFIG_CLK_EXYNOS850=y
 CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_MMC_DW=y
+CONFIG_DM_RTC=y
+CONFIG_RTC_EMULATION=y
 CONFIG_SOC_SAMSUNG=y
 CONFIG_EXYNOS_PMU=y
 CONFIG_EXYNOS_USI=y