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This commit enables to support MPEG-H 3D Audio bitstream pass-through via ffmpeg for Cast products.
To build this code, it is required to merge latest ffmpeg code which contains following commits.
  https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/610473b9679bfd3aff56c6889927447da860beb1
  https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/30047b6a571daa0fbdfa4eb4d907e510ab56ca3f
  https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/632b8298b70969f6ab43509fd276b33295d9e336

MPEG-H 3D Audio pass-through with MSE was supported in
  https://chromium-review.googlesource.com/c/chromium/src/+/1011291

Change-Id: I43bf1cb1d73dc90be7e40dc2f0d1f5c49263cb15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930369Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Yuki Tsuchiya <yuki.tsuchiya@sony.com>
Cr-Commit-Position: refs/heads/master@{#733953}