ARM: dts: BCM5301X: Add Ethernet MAC address to Luxul XWR-3150

Luxul XWR-3150 stores MAC as NVRAM variable. Add NVMEM cell for it and
reference it in the Ethernet interface node.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm47094-luxul-xwr-3150-v1.dts

@@ -25,6 +25,9 @@
 	nvram@1eff0000 {
 		compatible = "brcm,nvram";
 		reg = <0x1eff0000 0x10000>;
+
+		et0macaddr: et0macaddr {
+		};
 	};
 
 	leds {
@@ -72,6 +75,11 @@
 	};
 };
 
+&gmac0 {
+	nvmem-cells = <&et0macaddr>;
+	nvmem-cell-names = "mac-address";
+};
+
 &usb3 {
 	vcc-gpio = <&chipcommon 18 GPIO_ACTIVE_HIGH>;
 };