ARM: armv7: move CONFIG_ARMV7_PSCI to Kconfig

Add ARCH_SUPPORT_PSCI as a non-configurable option that platforms
can select.  Then, move CONFIG_ARMV7_PSCI, which is automatically
enabled if both ARMV7_NONSEC and ARCH_SUPPORT_PSCI are enabled.

Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index 8961458..7bee6c7 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -8,6 +8,7 @@
 	select CPU_V7
 	select CPU_V7_HAS_NONSEC
 	select ARMV7_NONSEC
+	select ARCH_SUPPORT_PSCI
 
 config ARCH_UNIPHIER_64BIT
 	bool