Extend the capability of MT7622 pinctrl with adding EINT so that each
GPIO can be used to notify CPU when a signal state is changing on the
line as an external interrupt.
Signed-off-by: NSean Wang <sean.wang@mediatek.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>