The Xiaomi AX3000T has two hardware revisions. One uses MT7531
switch, and the other uses AN8855 switch. Set "mediatek,switch"
property to "auto" to be compatible with different switches.
Tested-by: Mikhail Zhilkin <csharper2005@gmail.com>
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
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