ARM: Rmobile: Rename CONFIG_RMOBILE to CONFIG_ARCH_RMOBILE

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/mach-rmobile/Kconfig b/arch/arm/mach-rmobile/Kconfig
index 85c06eb..5915768 100644
--- a/arch/arm/mach-rmobile/Kconfig
+++ b/arch/arm/mach-rmobile/Kconfig
@@ -1,4 +1,4 @@
-if RMOBILE
+if ARCH_RMOBILE
 
 choice
 	prompt "Renesus ARM SoCs board select"