ramips: fix Ethernet random MAC address for HILINK HLK-7628N

Set the ethernet address from flash.

MAC addresses as verified by OEM firmware:

  use   interface  source
  2g    wlan0      factory 0x04 (label)
  LAN   eth0.1     factory 0x28 (label+1)
  WAN   eth0.2     factory 0x2e (label+2)

Fixes: 671c9d1 ("ramips: add support for HILINK HLK-7628N")

Signed-off-by: Liu Yu <f78fk@live.com>
[drop old MAC address setup from 02_network, cut out state_default
changes, face-lift commit message, add Fixes:]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ramips/dts/mt7628an_hilink_hlk-7628n.dts

@@ -80,6 +80,10 @@
 	};
 };
 
+&ethernet {
+	mtd-mac-address = <&factory 0x28>;
+};
+
 &wmac {
 	status = "okay";
 };

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

@@ -168,6 +168,7 @@ ramips_setup_macs()
 		lan_mac=$wan_mac
 		;;
 	cudy,wr1000|\
+	hilink,hlk-7628n|\
 	hilink,hlk-7688a|\
 	wavlink,wl-wn577a2|\
 	wavlink,wl-wn578a2)
@@ -187,10 +188,6 @@ ramips_setup_macs()
 		wan_mac=$(mtd_get_mac_binary factory 0x22)
 		label_mac=$wan_mac
 		;;
-	hilink,hlk-7628n)
-		lan_mac=$(macaddr_setbit_la "$(cat /sys/class/net/eth0/address)")
-		wan_mac=$(macaddr_add "$lan_mac" 1)
-		;;
 	hiwifi,hc5661a|\
 	hiwifi,hc5761a|\
 	hiwifi,hc5861b)