Adding OpenWrt support for Xiaomi AX3600 (Part 1)

[Apache14]

I have started a general IPQ807x thread here now we have a lot more of the HW working :

IPQ807x SoC Investigation / Status [WIP]

Hello all, Im making this thread to make a central location for IPQ807x SoC information / status outside of the AX3600 thread. I have been working on the Xiaomi AX3600 device alongside @gmzhu , the current status of the HW is Working Linux Boot Nand LED's Ethernet Ports (lots of thanks to @gmzhuo for getting this working) Q6 firmware loading ath11k loads / inits OK Not Working / Not Done PCIe (tho this could be just the AX3600) Switch / VLAN setup WiFi caldata extract from ART Wifi AP (bs…

Should help get others with IPQ807x based HW startes