ARM: dts: exynos: Add Ethernet interface description for Odroid U3

Add Ethernet interface description for Odroid U3.

Add an alias to enable bootloaders to find the Ethernet interface
and assign a MAC address.

Signed-off-by: Łukasz Stelmach <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/exynos4412-odroidu3.dts

···
 	model = "Hardkernel ODROID-U3 board based on Exynos4412";
 	compatible = "hardkernel,odroid-u3", "samsung,exynos4412", "samsung,exynos4";
 
+	aliases {
+		ethernet = &ethernet;
+	};
+
 	memory@40000000 {
 		device_type = "memory";
 		reg = <0x40000000 0x7FF00000>;
···
 };
 
 &ehci {
+	#address-cells = <1>;
+	#size-cells = <0>;
 	phys = <&exynos_usbphy 2>, <&exynos_usbphy 3>;
 	phy-names = "hsic0", "hsic1";
+
+	ethernet: usbether@2 {
+		compatible = "usb0424,9730";
+		reg = <2>;
+		local-mac-address = [00 00 00 00 00 00]; /* Filled in by a bootloader */
+	};
 };
 
 &hsotg {