ramips: fix MAC address setup for Xiaomi MiWiFi Nano

MAC addresses are stored in factory partition at:
0x0004: WiFi 2.4GHz (label_mac +1)
0x0028: LAN, WAN (label_mac)

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

target/linux/ramips/dts/mt7628an_xiaomi_miwifi-nano.dts

@@ -14,6 +14,7 @@
 		led-failsafe = &led_status_red;
 		led-running = &led_status_blue;
 		led-upgrade = &led_status_amber;
+		label-mac-device = &ethernet;
 	};
 
 	chosen {

target/linux/ramips/mt76x8/base-files/etc/board.d/02_network

@@ -171,8 +171,7 @@ ramips_setup_macs()
 	rakwireless,rak633|\
 	unielec,u7628-01-16m|\
 	wavlink,wl-wn575a3|\
-	wiznet,wizfi630s|\
-	xiaomi,miwifi-nano)
+	wiznet,wizfi630s)
 		wan_mac=$(macaddr_add "$(mtd_get_mac_binary factory 0x28)" 1)
 		;;
 	skylab,skw92a|\