dt-bindings: pinctrl: add bindings for Mediatek MT8365 SoC

Add devicetree bindings for Mediatek MT8365 pinctrl driver.

Signed-off-by: Bernhard Rosenkränzer <bero@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230125143503.1015424-5-bero@baylibre.com


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