[automerger skipped] [DO NOT MERGE]Move offload start related flags from BTA_AV_SCB to am: fa67c2de -s ours am: e62faafc -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bt/+/16187625

Change-Id: I40ba507d3e2f5a7d8e40596f2734a4ce37415d9d