ARM: dts: imx6q: add pinctrls for WEIM NOR

Add two pinctrls for WEIM:
   one for the weim nor, another for the chipselect.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>