ARM: Rmobile: Rename CONFIG_RMOBILE to CONFIG_ARCH_RMOBILE

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 43ae79a..5000d87 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -59,7 +59,7 @@
 machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
 machine-$(CONFIG_ARCH_SNAPDRAGON)	+= snapdragon
 machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
-machine-$(CONFIG_RMOBILE)		+= rmobile
+machine-$(CONFIG_ARCH_RMOBILE)		+= rmobile
 machine-$(CONFIG_ARCH_ROCKCHIP)		+= rockchip
 machine-$(CONFIG_STM32)			+= stm32
 machine-$(CONFIG_TEGRA)			+= tegra