rmobile: Drop CONFIG_RMOBILE

This has been renamed to CONFIG_ARCH_RMOBILE but this one was left behind.
It doesn't point to a directory that exists, so just drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 7d79076..653eef8 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -37,7 +37,6 @@
 obj-$(if $(filter bcmcygnus,$(SOC)),y) += bcmcygnus/
 obj-$(if $(filter bcmnsp,$(SOC)),y) += bcmnsp/
 obj-$(if $(filter ls102xa,$(SOC)),y) += ls102xa/
-obj-$(CONFIG_RMOBILE) += rmobile/
 obj-$(if $(filter stv0991,$(SOC)),y) += stv0991/
 obj-$(CONFIG_ARCH_SUNXI) += sunxi/
 obj-$(CONFIG_VF610) += vf610/