pinctrl: mediatek: Remove unneded semicolon

It's not needed an is just creating a null statement, so remove it.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Hongzhou Yang <hongzhou.yang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>