ARM: imx6: move v7_cpu_resume() into suspend-imx6.S

The suspend-imx6.S is introduced recently for suspend low-level assembly
code.  Since function v7_cpu_resume() is only used by suspend support,
it makes sense to move the function into suspend-imx6.S, and control the
build of the file with CONFIG_SUSPEND option.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/Makefile

@@ -103,9 +103,10 @@ obj-$(CONFIG_SOC_IMX6Q) += clk-imx6q.o mach-imx6q.o
 obj-$(CONFIG_SOC_IMX6SL) += clk-imx6sl.o mach-imx6sl.o
 
 AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
-obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o headsmp.o suspend-imx6.o
+obj-$(CONFIG_SUSPEND) += suspend-imx6.o
+obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o headsmp.o
 # i.MX6SL reuses i.MX6Q code
-obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o headsmp.o suspend-imx6.o
+obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o headsmp.o
 
 # i.MX5 based machines
 obj-$(CONFIG_MACH_MX51_BABBAGE) += mach-mx51_babbage.o