ARM: dts: imx6qdl-colibri: add phy to fec

Add the phy-node and mdio bus to the fec-node, represented as is on
hardware.
This commit includes micrel,led-mode that is set to the default
value, prepared for someone who wants to change this.

Signed-off-by: Philippe Schenker <[e-mail]>
Acked-by: Marcel Ziswiler <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

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

···
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
 	phy-mode = "rmii";
+	phy-handle = <&ethphy>;
 	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ethphy: ethernet-phy@0 {
+			reg = <0>;
+			micrel,led-mode = <0>;
+		};
+	};
 };
 
 &hdmi {