[automerger skipped] DO NOT MERGE Add mutex for std::map in btif_av.cc am:...

[automerger skipped] DO NOT MERGE Add mutex for std::map in btif_av.cc am: 4e1a76ea am: a7244741 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bt/+/13425807

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I9be6ab04ac16959adce4f8ad66a77fa4cffe654e