ARM: tegra: colibri_t20: 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: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-colibri.dtsi

@@ -482,6 +482,13 @@
 		status = "okay";
 		nvidia,phy-reset-gpio = <&gpio TEGRA_GPIO(V, 1)
 			GPIO_ACTIVE_LOW>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		asix@1 {
+			reg = <1>;
+			local-mac-address = [00 00 00 00 00 00];
+		};
 	};
 
 	usb-phy@c5004000 {