This commit includes pinctrl driver for Mediatek MT7986

The difference of pinctrl between mt7986a and mt7986b
is that pin-41 to pin-65 do not exist on mt7986b
Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Acked-by: Sean Wang <sean.wang@kernel.org>
Link: https://lore.kernel.org/r/20211022124036.5291-3-sam.shih@mediatek.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>