codec2: advertise default VP8 profiles if none are advertised

Some VP8 codec may not have advertised profile/levels. Assume they
support the default profile (Profile Version 0), which translates
to main profile/level version 0 in MediaCodec terminology.

Bug: 193098920
Change-Id: Ic2a05a21118bf44060875450b31c8b15faa1095f
1 file changed