ARM: imx_v6_v7_defconfig: Re-sync defconfig

Re-sync the defconfig by doing:

make savedefconfig
cp defconfig arch/arm/configs/imx_v6_v7_defconfig

and only keep the options that were moved around.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>