arm: imx: imx-common: init: move arch init common setup

Move common imx6 arch init setup, init.c can be extended
and reused to support imx7 SoC keeping init arch common
code.

Signed-off-by: Adrian Alonso <aalonso@freescale.com>
diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile
index 3b034e1..d77a236 100644
--- a/arch/arm/imx-common/Makefile
+++ b/arch/arm/imx-common/Makefile
@@ -19,7 +19,7 @@
 obj-$(CONFIG_SPL_BUILD)	+= spl.o
 endif
 ifeq ($(SOC),$(filter $(SOC),mx6))
-obj-y 	+= cache.o
+obj-y 	+= cache.o init.o
 obj-$(CONFIG_CMD_SATA) += sata.o
 obj-$(CONFIG_IMX_VIDEO_SKIP) += video.o
 endif