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

[Justin Mazzola Paluska]

On 12/21/20 12:11 PM, Kalle Valo wrote:
>> 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?

The OpenWRT version is:

OpenWrt 19.07.5 r11257-5090152ae3 / LuCI openwrt-19.07 branch 
git-20.341.57626-51f55b5

(This is the latest stable release.)
     --Justin