ARM: dts: sun8i: a83t: Remove unused address-cells/size-cells of dwmac-sun8i

ddress-cells/size-cells is unnecessary for dwmac-sun8i node.
It was in early days, but since a mdio node is used, it could be
removed.

This patch fix the following DT warning:
Warning (avoid_unnecessary_addr_size): /soc/ethernet@1c50000: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property
Signed-off-by: NCorentin Labbe <clabbe@baylibre.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun8i-a83t.dtsi

@@ -902,8 +902,6 @@
 			reset-names = "stmmaceth";
 			clocks = <&ccu 27>;
 			clock-names = "stmmaceth";
-			#address-cells = <1>;
-			#size-cells = <0>;
 			status = "disabled";
 
 			mdio: mdio {