Add mt2701 support using mediatek common pinctrl driver.
MT2701 have some special pins need an extra setting register
than other ICs, so adding this support to common code.
Signed-off-by: NBiao Huang <biao.huang@mediatek.com>
Acked-by: NYingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>