revert last 3 commits

fix audio issues
facial recognition blobs (reverted from commit 22cfccc3f364859c4cced185749328c786da4e77)
shamu: fix vendor-blobs for facial recognition (reverted from commit a3e7a97f46bb519ca909c2df4c669e3ae3d91e37)
shamu: add drm blobs (reverted from commit b88dab1bd2029cbd6309643c0c4dcc29de938dff)