wireless-next patches for v5.20

Fourth set of patches for v5.20, last few patches before the merge
window. Only driver changes this time, mostly just fixes and cleanup.

Major changes:

brcmfmac

* support brcm,ccode-map-trivial DT property

wcn36xx

* add debugfs file to show firmware feature strings
Merge ath-next from git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git

ath.git patches for v5.20. Major changes:

ath11k:

* fix WCN9074 to work again

* revert rfkill support as it was causing problems