mediatek: filogic: add support for TP-Link Festa FR365

mediatek: filogic: add support for TP-Link Festa FR365

Hardware
--------
SOC     : MediaTek MT7981B 2x A53
RAM     : NT5AD256M16E4-JR 512MiB
Flash   : ESMT F50L1G41LB 128MB
ETH     : 5x 1GbE (1x WAN, 4x LAN)
          1x SFP+ (2.5 GbE)
Switch  : MediaTek MT7531AE
WiFi    : MediaTek MT7976D
Buttons : Reset
Power   : DC 12V 2A

Installation
------------
1. Disassemble the device
2. Create solder bridge on R85, R86, Solder 4-pin header on J4.
3. Connect UART console.
4. In U-Boot shell, enter the following commands to prepare flashing
```
enable_phy
extra_para set extra-para score 100
extra_para set extra-para fwFlag good
```
5. Use `mtkupgrade` command to TFTP flash openwrt-mediatek-filogic-tplink_fr365-v1-squashfs-factory.bin
6. Reboot the device

Signed-off-by: Yonghyu Ban <yhban@silicon.moe>
Link: https://github.com/openwrt/openwrt/pull/19203
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>