ramips: add label MAC address for Netgear EX6130

The MAC address on the label of this device corresponds to the
2.4 GHz and ethernet MAC address.

Signed-off-by: Adrian Schmutzler <[email protected]>

target/linux/ramips/dts/mt7620a_netgear_ex6130.dts

@@ -13,6 +13,7 @@
 		led-failsafe = &led_power_green;
 		led-running = &led_power_green;
 		led-upgrade = &led_power_green;
+		label-mac-device = &ethernet;
 	};
 
 	leds {