pinctrl: add mt2712 pinctrl driver

The commit includes mt2712 pinctrl driver.

Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
Reviewed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
4 files changed