Follow the conventions for pinctrl:
 - grouping pinctrl in logical alphabatized groups
 - remove any pinctrl not being used by a driver or needed by user
 - move iomuxc to bottom of file for readability
Signed-off-by: NTim Harvey <tharvey@gateworks.com>
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>