Adding OpenWrt support for Xiaomi AX3600 (Part 1)

[robimarko]

Sure, we can make a new thread.

OpenWrt support for Xiaomi AX9000

Let's move the Xiaomi AX9000 related discussion to a new thread to reduce off-topics in the AX3600 one. @kirdes @sumo Current state as of (07.11.2022). Working: 4x 1G ports 1x 2.5G port USB 3.0 port QCA9889 IoT radio Built-in IPQ8074 radios (2.4G and high 5GHz band) LED-s Buttons Not working: PWM LED effects (Honestly not worth the effort) Fan controller (Lacking driver)