pinctrl: mediatek: Add MT8167 Pinctrl driver

This commit adds the pinctrl driver for the MediaTek's MT8167 SoC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Link: https://lore.kernel.org/r/20200907110221.1691168-2-fparent@baylibre.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>