ARM: uniphier: move (and rename) CONFIG_UNIPHIER_L2CACHE_ON to Kconfig

Move this option to Kconfig, renaming it into CONFIG_CACHE_UNIPHIER.
The new option name makes sense enough, and the same as Linux has.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index e39ced6..a558073 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -70,6 +70,13 @@
 	depends on ARCH_UNIPHIER_PRO5_PXS2_LD6B
 	default y
 
+config CACHE_UNIPHIER
+	bool "Enable the UniPhier L2 cache controller"
+	depends on ARCH_UNIPHIER_32BIT
+	default y
+	help
+	  This option allows to use the UniPhier System Cache as L2 cache.
+
 config MICRO_SUPPORT_CARD
 	bool "Use Micro Support Card"
 	help