ath11k-qca6390-bringup-202012140938: rebate to v5.10 and MHI M2 workaround

[Kalle Valo]

Justin Mazzola Paluska <jmp at justinmp.com> writes:

> Some more configuration hacking lead to success at 5 GHz!
>
> My router supports 160 MHz channels in the 5 GHz bands [1].  I
> switched the router to advertising 80 MHz channels and the card could
> connect.

Thanks for the detailed debugging, this should help us reproducing the
problem. What's the exact openwrt version you are using?

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