ARM: dts: mt8135: Add pinctrl/GPIO/EINT node for mt8135.

Add pinctrl,GPIO and EINT node to mt8135.dtsi.

Signed-off-by: Hongzhou Yang <hongzhou.yang@mediatek.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Singed-off-by: Matthias Brugger <matthias.bgg@gmail.com>