ARM: imx: add basic imx6sx SoC support

Add basic suppport for i.MX6 SoloX SoC.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --cc arch/arm/mach-imx/Kconfig
Simple merge

diff --cc arch/arm/mach-imx/Makefile
Simple merge

diff --cc arch/arm/mach-imx/cpu.c
Simple merge

diff --cc arch/arm/mach-imx/mach-imx6sx.c
Simple merge

diff --cc arch/arm/mach-imx/mxc.h
Simple merge