ENGR00269945: ARM: imx6: maintain pinctrl setting outside bus topology

ENGR00269945: ARM: imx6: maintain pinctrl setting outside bus topology

The patch moves all pinctrl setting nodes outside bus topology using
label, so that we can reduce some indent levels for these nodes and
avoid churning main device nodes structure chunk.

While at it, the patch also sorts those pinctrl setting nodes
alphabetically.

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