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

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When you are done with debricking put a few fw_setenv command in /etc/rc.local:

# to select slot 0, only need to set once ;)
fw_setenv flag_last_success 0

# to reset "try counters" for slot 0 and slot 1
fw_setenv flag_try_sys1_failed 0
fw_setenv flag_try_sys2_failed 0

It will do the trick to survive 7 reboots. :ok_hand:

And to verify if you have 2022 or newer U-Boot, just grep for it in the u-boot partition:

root@OpenWrt:/# grep ^U-Boot /dev/mtd2
U-Boot
U-Boot console
U-Boot
U-Boot BUG at %s:%d!
U-Boot 2014.04-rc1 (May 20 2022 - 10:19:21)

root@OpenWrt:/# grep mtd2 /proc/mtd
mtd2: 00080000 00020000 "u-boot"
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