arm64: dts: mediatek: mt7981b-openwrt-one: Add address/size cells to eth

The ethernet node has two MAC subnodes and cannot use the default
address/size cells: set address cells to 1 and size cells to 0.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: AngeloGioacchino Del Regno

arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts

@@ -90,6 +90,8 @@
 };
 
 &eth {
+	#address-cells = <1>;
+	#size-cells = <0>;
 	status = "okay";
 
 	/* WAN interface */