VP9: Synthesize CSD from frame header

If the CodecPrivate data is missing from the container, use the first
frame's frame header to parse and synthesize the CSD.

Test: atest android.mediav2.cts.DecoderColorAspectsTest#testColorAspects
Bug: 295804596
Change-Id: I489e08ff6b1ebe925f8b896bb1126b79eba224e8
4 files changed