pinctrl: mediatek: Add Pinctrl/GPIO driver for mt8135.

The mediatek SoCs have GPIO controller that handle both the muxing and GPIOs.

The GPIO controller have pinmux, pull enable, pull select, direction and output high/low control.

This driver include common driver and mt8135 part.
The common driver include the pinctrl driver and GPIO driver.
The mt8135 part contain its special device data.

Signed-off-by: Hongzhou Yang <hongzhou.yang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --cc drivers/pinctrl/Kconfig
Simple merge

diff --cc drivers/pinctrl/Makefile
Simple merge

diff --cc drivers/pinctrl/mediatek/Kconfig
Simple merge

diff --cc drivers/pinctrl/mediatek/Makefile
Simple merge

diff --cc drivers/pinctrl/mediatek/pinctrl-mt8135.c
Simple merge

diff --cc drivers/pinctrl/mediatek/pinctrl-mtk-common.c
Simple merge

diff --cc drivers/pinctrl/mediatek/pinctrl-mtk-common.h
Simple merge

diff --cc drivers/pinctrl/mediatek/pinctrl-mtk-mt8135.h
Simple merge

diff --cc include/dt-bindings/pinctrl/mt65xx.h
Simple merge