ARM: dts: sunxi: Fix GIC compatible

As can be shown by the YAML schema now, the combination of GIC compatibles
we were using has never been an option.

Switch to the gic-400 variant, which is the more correct option.
Acked-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun6i-a31.dtsi

@@ -1027,7 +1027,7 @@
 		};
 
 		gic: interrupt-controller@1c81000 {
-			compatible = "arm,cortex-a7-gic", "arm,cortex-a15-gic";
+			compatible = "arm,gic-400";
 			reg = <0x01c81000 0x1000>,
 			      <0x01c82000 0x2000>,
 			      <0x01c84000 0x2000>,

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -1453,7 +1453,7 @@
 		};
 
 		gic: interrupt-controller@1c81000 {
-			compatible = "arm,gic-400", "arm,cortex-a7-gic", "arm,cortex-a15-gic";
+			compatible = "arm,gic-400";
 			reg = <0x01c81000 0x1000>,
 			      <0x01c82000 0x2000>,
 			      <0x01c84000 0x2000>,

arch/arm/boot/dts/sun8i-a23-a33.dtsi

@@ -599,7 +599,7 @@
 		};
 
 		gic: interrupt-controller@1c81000 {
-			compatible = "arm,cortex-a7-gic", "arm,cortex-a15-gic";
+			compatible = "arm,gic-400";
 			reg = <0x01c81000 0x1000>,
 			      <0x01c82000 0x2000>,
 			      <0x01c84000 0x2000>,

arch/arm/boot/dts/sun8i-a83t.dtsi

@@ -931,7 +931,7 @@
 		};
 
 		gic: interrupt-controller@1c81000 {
-			compatible = "arm,cortex-a7-gic", "arm,cortex-a15-gic";
+			compatible = "arm,gic-400";
 			reg = <0x01c81000 0x1000>,
 			      <0x01c82000 0x2000>,
 			      <0x01c84000 0x2000>,

arch/arm/boot/dts/sun8i-v3s.dtsi

@@ -413,7 +413,7 @@
 		};
 
 		gic: interrupt-controller@1c81000 {
-			compatible = "arm,cortex-a7-gic", "arm,cortex-a15-gic";
+			compatible = "arm,gic-400";
 			reg = <0x01c81000 0x1000>,
 			      <0x01c82000 0x1000>,
 			      <0x01c84000 0x2000>,

arch/arm/boot/dts/sun9i-a80.dtsi

@@ -527,7 +527,7 @@
 		};
 
 		gic: interrupt-controller@1c41000 {
-			compatible = "arm,cortex-a7-gic", "arm,cortex-a15-gic";
+			compatible = "arm,gic-400";
 			reg = <0x01c41000 0x1000>,
 			      <0x01c42000 0x2000>,
 			      <0x01c44000 0x2000>,