ARM: dts: imx1-apf9328: Fix Ethernet node name

Per davicom,dm9000.yaml, the Ethernet node name should be 'ethernet'.

Change it to fix the following schema warning:

imx1-apf9328.dtb: eth@4,c00000: $nodename:0: 'eth@4,c00000' does not match '^ethernet(@.*)?$'
	from schema $id: http://devicetree.org/schemas/net/davicom,dm9000.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx1-apf9328.dts

@@ -54,7 +54,7 @@ nor: flash@0,0 {
 		#size-cells = <1>;
 	};
 
-	eth: eth@4,c00000 {
+	eth: ethernet@4,c00000 {
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_eth>;
 		compatible = "davicom,dm9000";