Merge "VP9: Synthesize CSD from frame header" into main am: a3914d801c

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2953128

Change-Id: I2be21cae7871309ff08f0cf2b1cf2cbeff9fb841
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>