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: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi
index 7a495c8..7ac1e50 100644
--- a/arch/arm/boot/dts/sun9i-a80.dtsi
+++ b/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>,