arm64: dts: apm: Update GPIO to control power-off on X-Gene v1 platforms

This patch updates gpio-keys node that supports power-off for
X-Gene v1 Mustang board to adapt with new changes in xgene-gpio-sb
driver (to support configuring some GPIO pins as interrupt pins).
Signed-off-by: Duc Dang <dhdang@apm.com>

arch/arm64/boot/dts/apm/apm-mustang.dts

@@ -30,7 +30,8 @@ button@1 {
 			label = "POWER";
 			linux,code = <116>;
 			linux,input-type = <0x1>;
-			interrupts = <0x0 0x2d 0x1>;
+			interrupt-parent = <&sbgpio>;
+			interrupts = <0x5 0x1>;
 		};
 	};