ARM: dts: imx6qdl-wandboard: add ethernet PHY description

Wandboard devicetrees lack the ethernet PHY description, add it.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-wandboard.dtsi

@@ -279,8 +279,18 @@ &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
 	phy-mode = "rgmii-id";
+	phy-handle = <&ethphy>;
 	phy-reset-gpios = <&gpio3 29 GPIO_ACTIVE_LOW>;
 	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ethphy: ethernet-phy@1 {
+			reg = <1>;
+		};
+	};
 };
 
 &mipi_csi {