mediatek: EAP111: add label-mac-device

Add the label-mac-device alias so that label MAC is set and can later
be used in userspace.

Signed-off-by: Robert Marko <[email protected]>

target/linux/mediatek/dts/mt7981a-edgecore-eap111.dts

@@ -15,6 +15,7 @@
 		led-failsafe = &led_green;
 		led-running = &led_green;
 		led-upgrade = &led_green;
+		label-mac-device = &gmac1;
 	};
 
 	chosen {