Add OpenWrt support for Xiaomi "Redmi AX6000"

[Japa18244]

Could someone please test wifi 2.4 at 40mhz on cell phones?

Asus TUF Gaming AX6000 support

Could someone test wifi 2.4 at 40mhz if it exceeds 100mb on smartphones? I have a Gl.Inet MT6000 with the same soc and it presents this bug in all versions of openwrt, it seems to be something related to mt76.