MTK SoC support external interrupt(EINT) from most SoC pins.
Add EINT support to pinctrl driver.
Signed-off-by: NMaoguang Meng <maoguang.meng@mediatek.com>
Signed-off-by: NHongzhou Yang <hongzhou.yang@mediatek.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>