ARM: imx6: introduce CONFIG_SOC_IMX6 for i.MX6 common stuff
ARM: imx6: introduce CONFIG_SOC_IMX6 for i.MX6 common stuff

The i.MX6 SoCs have something in common, so let's introduce
CONFIG_SOC_IMX6 for those stuff.

Signed-off-by: Shawn Guo <912cf7eb7d8018e2943586ae6657d21fd4e38239@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs