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/arch/arm/mach-uniphier/Makefile b/arch/arm/mach-uniphier/Makefile
index 124a1c6..7a0b25a 100644
--- a/arch/arm/mach-uniphier/Makefile
+++ b/arch/arm/mach-uniphier/Makefile
@@ -16,7 +16,9 @@
 obj-y += dram_init.o
 obj-y += board_init.o
 obj-$(CONFIG_BOARD_LATE_INIT) += board_late_init.o
+ifndef CONFIG_SYSRESET
 obj-y += reset.o
+endif
 
 obj-$(CONFIG_MICRO_SUPPORT_CARD) += sbc/ micro-support-card.o
 obj-y += pinctrl-glue.o