uboot-imx

pinctrl: rockchip: Clean the unused rockchip pinctrl drivers

If we used the pinctrl-rockchip driver, these code is not needed,
so remove them.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>