arm64: dts: allwinner: Fix DE2 bus node name

According to the device tree specification, any bus should have a 'bus'
node name.

Since it isn't the case for us on the DE2 bus, fix that.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi

@@ -217,7 +217,7 @@ soc {
 		#size-cells = <1>;
 		ranges;
 
-		de2@1000000 {
+		bus@1000000 {
 			compatible = "allwinner,sun50i-a64-de2";
 			reg = <0x1000000 0x400000>;
 			allwinner,sram = <&de2_sram 1>;

arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi

@@ -101,7 +101,7 @@ soc {
 		#size-cells = <1>;
 		ranges;
 
-		display-engine@1000000 {
+		bus@1000000 {
 			compatible = "allwinner,sun50i-h6-de3",
 				     "allwinner,sun50i-a64-de2";
 			reg = <0x1000000 0x400000>;