[automerger skipped] Revert^2 "StagefrightRecoder: Disabling B-frame support" am: aa31516ef8 -s ours

am skip reason: Merged-In I6b722876328a71aa5b3c49b53e487a3af966f998 with SHA-1 61ed373ba3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/28125711

Change-Id: Ic67df18402e018fb92b5b0bfe521b7ec51248c00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>