ARM: keystone: move SoC sources to mach-keystone

Move
arch/arm/cpu/armv7/keystone/* -> arch/arm/mach-keystone/*

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Tom Rini <trini@ti.com>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 0699a4d..678ac13 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -7,6 +7,7 @@
 machine-$(CONFIG_ARCH_AT91)		+= at91
 machine-$(CONFIG_ARCH_DAVINCI)		+= davinci
 machine-$(CONFIG_ARCH_HIGHBANK)		+= highbank
+machine-$(CONFIG_ARCH_KEYSTONE)		+= keystone
 # TODO: rename CONFIG_KIRKWOOD -> CONFIG_ARCH_KIRKWOOD
 machine-$(CONFIG_KIRKWOOD)		+= kirkwood
 # TODO: rename CONFIG_TEGRA -> CONFIG_ARCH_TEGRA