mips: ath79: dts: Add ethernet MAC nodes for ar933x

Add node for both ethernet controllers in the ar933x.
The PHY is attached only to the first ethernet controller.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Wills Wang <wills.wang@live.com>

arch/mips/dts/ar933x.dtsi

@@ -73,6 +73,32 @@
 
 				status = "disabled";
 			};
+
+			gmac0: eth@0x19000000 {
+				compatible = "qca,ag7240-mac";
+				reg = <0x19000000 0x200>;
+				phy = <&phy0>;
+				phy-mode = "rmii";
+
+				status = "disabled";
+
+				mdio {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					phy0: ethernet-phy@0 {
+						reg = <0>;
+					};
+				};
+			};
+
+			gmac1: eth@0x1a000000 {
+				compatible = "qca,ag7240-mac";
+				reg = <0x1a000000 0x200>;
+				phy = <&phy0>;
+				phy-mode = "rgmii";
+
+				status = "disabled";
+			};
 		};
 
 		spi0: spi@1f000000 {