arm64: dts: imx8mm-kontron: fix ethernet node name

The node name of Ethernet controller should be "ethernet" instead of
"usbether" as required by Ethernet controller devicetree schema:
 Documentation/devicetree/bindings/net/ethernet-controller.yaml

This patch can potentially affect boot loaders patching against full
node path instead of using device aliases.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts

@@ -182,7 +182,7 @@ usb1@1 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		usbnet: usbether@1 {
+		usbnet: ethernet@1 {
 			compatible = "usb424,ec00";
 			reg = <1>;
 			local-mac-address = [ 00 00 00 00 00 00 ];