[bug] Triple whammy of mt7996e bugs on 7.2+

[Ilya K]

> I've tried just cherry-picking all the mt76 changes from Felix's current mt76-fixes (minus the AQL/PS stuff that does needs 7.3 bits in mac80211), booted it just now, jt hasn't exploded yet, so we'll see.

OK so update on that: this branch (bpi-r4-72-mt76-fixes) exploded after two days, which is an improvement but still not perfect (and possibly lucky); the branch with all the patches from Ben's tree is still holding on another three days later... I was kinda hoping it would crash so maybe the extra logging helps point out the actual issue, but alas. I'll keep running that for now.