ARM: BCM53016: MR32: get mac-address from nvmem

The MAC-Address of the MR32's sole ethernet port is
located in offset 0x66 of the attached AT24C64 eeprom.

Signed-off-by: Christian Lamparter <[e-mail]>
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/bcm53016-meraki-mr32.dts

···
 			reg = <0x50>;
 			pagesize = <32>;
 			read-only;
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			mac_address: mac-address@66 {
+				reg = <0x66 0x6>;
+			};
 		};
 	};
 };
···
 	 *	enable-gpios = <&chipcommon 20 GPIO_ACTIVE_HIGH>;
 	 *};
 	 */
+};
+
+&gmac0 {
+	nvmem-cell-names = "mac-address";
+	nvmem-cells = <&mac_address>;
 };
 
 &gmac1 {