Add OpenWrt support for Xiaomi "Redmi AX6000"

For Developers
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I was able to make a build of OpenWrt for BananaPi-R3 that was added by @daniel last week, drop into AX6000 u-boot console, tftpboot initramfs-recovery and voila!

BusyBox v1.35.0 (2022-09-05 09:46:47 UTC) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt SNAPSHOT, r0+20481-09ea1db93b
 -----------------------------------------------------
=== WARNING! =====================================
There is no root password defined on this device!
Use the "passwd" command to set up a new password
in order to prevent unauthorized SSH logins.
--------------------------------------------------
root@OpenWrt:/# uname -a
Linux OpenWrt 5.15.64 #0 SMP Tue Sep 6 10:15:48 2022 aarch64 GNU/Linux

OpenWrt running on a Redmi AX6000!

FWIW: on a uart console, spam ctrl-c immediately after power on and you'll drop into u-boot.

I need to get a good start on a dts now. I've already started here, but I'm about at the edge of my knowledge: https://github.com/soxrok2212/openwrt/blob/master/target/linux/mediatek/dts/mt7986a-xiaomi-redmi-router-ax6000.dts

As it stands, it builds but images made with it do not boot.

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