Merge tag 'mt76-for-kvalo-2019-02-18' of https://github.com/nbd168/wireless

mt76 patches for 5.1

* beacon support for USB devices (mesh+ad-hoc only)
* mt76x0 tx power fixes
* fixes for encryption, calibration and ED/CCA
* more code unification
* USB fixes
* fix for using the correct hweight8 function