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-tegra/tegra124/Kconfig b/arch/arm/mach-tegra/tegra124/Kconfig
index 800b315..df77462 100644
--- a/arch/arm/mach-tegra/tegra124/Kconfig
+++ b/arch/arm/mach-tegra/tegra124/Kconfig
@@ -8,6 +8,7 @@
 	bool "NVIDIA Tegra124 Jetson TK1 board"
 	select CPU_V7_HAS_NONSEC
 	select CPU_V7_HAS_VIRT
+	select ARCH_SUPPORT_PSCI
 
 config TARGET_CEI_TK1_SOM
 	bool "Colorado Engineering Inc Tegra124 TK1-som board"