MAINTAINERS: update entry for Mediatek pin controller

Add new files for the entry
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -11106,6 +11106,7 @@ L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/devicetree/bindings/pinctrl/pinctrl-mt65xx.txt
 F:	Documentation/devicetree/bindings/pinctrl/pinctrl-mt7622.txt
+F:	drivers/pinctrl/mediatek/mtk-eint.*
 F:	drivers/pinctrl/mediatek/pinctrl-mtk-common.*
 F:	drivers/pinctrl/mediatek/pinctrl-mt2701.c
 F:	drivers/pinctrl/mediatek/pinctrl-mt7622.c