Adding OpenWrt support for Xiaomi "Redmi Router AX6S"/"Xiaomi Router AX3200"

[F4FXL]

@remittor

dd if=/dev/mtd2 2>/dev/null | grep -cF " 2022 - "
dd if=/dev/mtd2 2>/dev/null | grep -cF "do_env_export"
dd if=/dev/mtd2 2>/dev/null | grep -cF "GigaDevice"

I got 0,1,1 how should I interpret this?
The devices are brand new, came with older stock firmware with telnet enabled. Running as dumb AP on OpenWrt 23.05.2 , all is working smoothly.