main/linux-firmware: upgrade to 20190322, update rpi firmwares
* update rpi wifi firmware, use better source * update rpi bluetooth firmware * purge additional source code files ref #9549 (cherry picked from commit 0a01a287)
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* update rpi wifi firmware, use better source * update rpi bluetooth firmware * purge additional source code files ref #9549 (cherry picked from commit 0a01a287)