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/Kconfig b/arch/arm/Kconfig
index c871eaf..37fee43 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -816,10 +816,13 @@
 	bool "Support ls1021aqds"
 	select CPU_V7
 	select SUPPORT_SPL
+	select ARCH_SUPPORT_PSCI
+
 config TARGET_LS1021ATWR
 	bool "Support ls1021atwr"
 	select CPU_V7
 	select SUPPORT_SPL
+	select ARCH_SUPPORT_PSCI
 
 config TARGET_LS1043AQDS
 	bool "Support ls1043aqds"