imx: header/gpio driver cleanups

  arch/arm/include/asm/arch-mx35/mx35_pins.h |    2 --
  arch/arm/include/asm/arch-mx5/mx5x_pins.h  |    2 --
  arch/arm/include/asm/arch-mx6/imx-regs.h   |    2 --
  drivers/gpio/mxc_gpio.c                    |   12 ++++++------
  4 files changed, 6 insertions(+), 12 deletions(-)

Changed from v1:
Dropped defining extra GPIO_TO_PORT macros

Thanks,
Vikram