ralink: add irq to mt7628 gpio node

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 47076

target/linux/ramips/dts/mt7628an.dtsi

@@ -80,6 +80,9 @@
 			compatible = "mtk,mt7628-gpio", "mtk,mt7621-gpio";
 			reg = <0x600 0x100>;
 
+			interrupt-parent = <&intc>;
+			interrupts = <6>;
+
 			gpio0: bank@0 {
 				reg = <0>;
 				compatible = "mtk,mt7621-gpio-bank";