ARM: uniphier: enable PSCI sysreset for uniphier_v8_defconfig

This configuration is supposed to be used with ARM Trusted Firmware,
so the SYSTEM_RESET is implemented in BL31.  Invoke PSCI instead of
U-Boot's own reset code because we need to coordinate with SCP
(System Control Processor) for the system-level power management.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/uniphier_v8_defconfig b/configs/uniphier_v8_defconfig
index c743fab..73bdaa8 100644
--- a/configs/uniphier_v8_defconfig
+++ b/configs/uniphier_v8_defconfig
@@ -1,4 +1,5 @@
 CONFIG_ARM=y
+CONFIG_ARM_SMCCC=y
 CONFIG_ARCH_UNIPHIER=y
 CONFIG_SYS_TEXT_BASE=0x84000000
 CONFIG_SYS_MALLOC_F_LEN=0x2000
@@ -29,6 +30,8 @@
 CONFIG_MMC_UNIPHIER=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_CADENCE=y
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_PSCI=y
 CONFIG_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y