pinctrl: mediatek: Add pinctrl driver for MT6795 Helio X10

Add support for the MediaTek Helio X10 (MT6795) SoC's GPIO/pinmux
controller.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220517083957.11816-3-angelogioacchino.delregno@collabora.com


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