Append additional owners to projects

This releaves reviewing burden from the frameworks/av owners.
Note that the lists of owners are inherited from the parent
directories thus the people listed in these files are owners
*in addition* to people listed in frameworks/av/OWNERS,
and frameworks/av/{media|services}/OWNERS.

Change-Id: I5e2db1c40cb807b906b2701fe446c874a8d19983
Test: not needed