ARM: dts: mt6589: Change compatible string for GIC

This patch changes the compatible string of the GIC to the
new "arm,cortex-a7-gic" which does reflect the actual hardware.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/boot/dts/mt6589.dtsi

@@ -82,7 +82,7 @@ timer: timer@10008000 {
 		};
 
 		gic: interrupt-controller@10211000 {
-			compatible = "arm,cortex-a15-gic";
+			compatible = "arm,cortex-a7-gic";
 			interrupt-controller;
 			#interrupt-cells = <3>;
 			reg = <0x10211000 0x1000>,