Add support for ASUS RT-AX89X AX6000

The fix was not easy! But everything worked out:
https://github.com/openwrt-xiaomi/openwrt/commit/f25b0acb8f21d0fc862ff5d5ec9c609e6b69a81e#diff-b3afd9d94ac53d0ac9bf36931d9c62e592be67f8c64114566e4a74daf249ec34R99-R108

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