ARM: dts: sun7i: cubietruck: Enable the GMAC

The CubieTruck uses the GMAC with an RGMII phy.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-cubietruck.dts

@@ -51,6 +51,18 @@ i2c2: i2c@01c2b400 {
 			pinctrl-0 = <&i2c2_pins_a>;
 			status = "okay";
 		};
+
+		gmac: ethernet@01c50000 {
+			pinctrl-names = "default";
+			pinctrl-0 = <&gmac_pins_rgmii_a>;
+			phy = <&phy1>;
+			phy-mode = "rgmii";
+			status = "okay";
+
+			phy1: ethernet-phy@1 {
+				reg = <1>;
+			};
+		};
 	};
 
 	leds {