ramips: mt7621: add support for Xiaomi Mi Router 4A Gigabit v2

Device is the same as Xiaomi Mi Router 4A Gigabit, except of:
- 5G WiFi is MT7663
- addresses of leds, wifi and eth ports are slightly changed

Specs:
  SoC:  MT7621
  CPU:  2 x 880 MHz
  ROM:  16 MB
  RAM:  128 MB
  WLAN: MT7603, MT7663

MAC addresses:
  WAN     ****  factory 0xe006 (label)
  LAN     *:f7  factory 0xe000
  2.4 GHz *:f8  factory 0x0000+0x4 (mtd-eeprom+0x4)
  5 GHz   *:f9  factory 0x8000+0x4 (mtd-eeprom+0x4)

Installation:

Factory firmware is based on a custom OpenWrt 17.x.
Installation is the same as for Xiaomi Mi Router 4A Gigabit.

Probably the easiest way to install is to use the script from
this repository: https://github.com/acecilia/OpenWRTInvasion/pull/155

In a more advanced case, you can do everything yourself:
- gain access to the device through one of the exploits described
  in the link above
- upload sysupgrade image to /tmp
- overwrite stock firmware:
  # mtd -e OS1 -r write /tmp/sysupgrade.bin OS1

Recovery:

Recovery procedure is the same as for Xiaomi Mi Router 4A Gigabit.
Possible options can be found here:
https://openwrt.org/inbox/toh/xiaomi/xiaomi_mi_router_4a_gigabit_edition

One of the ways is to use another router with OpenWrt:
- connect both routers by their LAN ports
- download stock firmware from [1]
- place it inside /tmp/test.bin on the main router
- configure PXE/TFTP on the main router
- power off 4Av2, hold Reset button, power on
- as soon as image download via TFTP starts, Reset can be released
- blinking blue wan LED will indicate the end of the flashing process,
  now router can be rebooted
[1] http://cdn.cnbj1.fds.api.mi-img.com/xiaoqiang/rom/r4av2/miwifi_r4av2_firmware_release_2.30.28.bin

Signed-off-by: Dmitry Sokolov <e323w@proton.me>

target/linux/ramips/mt7621/base-files/etc/board.d/01_leds

@@ -179,6 +179,9 @@ tplink,re650-v2)
 tplink,tl-wpa8631p-v3)
 	ucidef_set_led_netdev "lan" "LAN" "green:lan" "br-lan"
 	;;
+xiaomi,mi-router-4a-gigabit-v2)
+	ucidef_set_led_netdev "wan" "wan" "blue:wan" "wan" "link"
+	;;
 xiaomi,mi-router-ac2100)
 	ucidef_set_led_netdev "wan-blue" "WAN (blue)" "blue:wan" "wan"
 	;;

target/linux/ramips/mt7621/base-files/etc/board.d/02_network

@@ -72,7 +72,8 @@ ramips_setup_interfaces()
 	xiaomi,mi-router-3g|\
 	xiaomi,mi-router-3g-v2|\
 	xiaomi,mi-router-4|\
-	xiaomi,mi-router-4a-gigabit)
+	xiaomi,mi-router-4a-gigabit|\
+	xiaomi,mi-router-4a-gigabit-v2)
 		ucidef_set_interfaces_lan_wan "lan1 lan2" "wan"
 		;;
 	bolt,arion)