mediatek: filogic: add support for AsiaRF AP7986-003

mediatek: filogic: add support for AsiaRF AP7986-003

- SoC           : MediaTek MT7986AV, Quad-core 2.0 GHz ARM Cortex-A53 CPU
- RAM           : DDR3 512 MiB (Micron MT41K256M16TW-107)
- Flash         : SPI-NAND 128 MiB (Winbound W25N01GVZEIG)
- Ethernet      : 6 ports
  - LAN :
      5x 10/100/1000 Mbps RJ-45 Port
  - WAN :
      1x 10/100/1000/2500 Mbps RJ-45 Port (MaxLinear GPY211B1VC-LN8A)
- LED           : 19x LEDs (Green)
    1x  Power
    1x  Status (PWM-LED)
    1x  Debug (PWM-LED)
    2x  WiFi activity
    10x Ethernet LAN activity
    4x  Ethernet WAN activity
- UART          : 1x4 pin header on PCB [J1]
  - arrangement : 3.3V, RX, TX, GND
  - settings    : 115200, 8n1
- Button        : 3x (Reset, WPS, Power)
- WiFi          : 2x
    WiFi 6 2.4 Ghz + 5 Ghz (Mediatek MT7975N+MT7975PN)
- Socket        :
    1x Raspberry header 13x2
    1x JTAG 10x2
    1x USB-A (USB 3.0)
- Power         : 12V DC, 3A

MAC addresses :
    WLAN:       00:0A:52:xx:xx:xx   (Factory, 0x6)
    LAN:        00:0A:52:xx:xx:xx   (Factory, 0x24)
    WAN:        00:0A:52:xx:xx:xx   (Factory, 0x2a)

Flash instruction through LuCI:

This device is flashed OpenWRT base firmware with this target.
The LuCI webpage is integrated in default for upgrading.

Flash instruction through u-boot:

1. Prepare the TFTP server on PC.
2. Connect uart to PC, select "2. Upgrade firmware" in u-boot menu.
3. Select "0 - TFTP client (Default)", input client IP, server IP, IP netmask, flashed bin file path
4. Wait about 20 seconds to complete flashing

Signed-off-by: Elwin Huang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20071
Signed-off-by: Hauke Mehrtens <[email protected]>