ARM: tegra: colibri_t30: add local-mac-address property

Add empty local-mac-address property to be filled in by boot loader
(e.g. U-Boot).
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-colibri.dtsi

@@ -437,6 +437,13 @@ sdhci@78000600 {
 	/* EHCI instance 1: USB2_DP/N -> AX88772B */
 	usb@7d004000 {
 		status = "okay";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		asix@1 {
+			reg = <1>;
+			local-mac-address = [00 00 00 00 00 00];
+		};
 	};
 
 	usb-phy@7d004000 {