arm64: dts: amazon: Fix simple-bus node name schema warnings

Fix a couple of node name warnings from the schema checks:

arch/arm64/boot/dts/amazon/alpine-v2-evp.dt.yaml: io-fabric: $nodename:0: 'io-fabric' does not match '^(bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'
arch/arm64/boot/dts/amazon/alpine-v3-evp.dt.yaml: io-fabric: $nodename:0: 'io-fabric' does not match '^(bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250409210255.1541298-1-robh@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: robherring

arch/arm64/boot/dts/amazon/alpine-v2.dtsi

@@ -151,7 +151,7 @@
 			al,msi-num-spis = <160>;
 		};
 
-		io-fabric@fc000000 {
+		io-bus@fc000000 {
 			compatible = "simple-bus";
 			#address-cells = <1>;
 			#size-cells = <1>;

arch/arm64/boot/dts/amazon/alpine-v3.dtsi

@@ -361,7 +361,7 @@
 			interrupt-parent = <&gic>;
 		};
 
-		io-fabric@fc000000 {
+		io-bus@fc000000 {
 			compatible = "simple-bus";
 			#address-cells = <1>;
 			#size-cells = <1>;