Merge "AudioPolicyService: Acquire mutex for SoundTriggerSession" into lmp-dev am: 35a587cdc5 am: 27c4e661d4  -s ours am: ac43fbe5a6  -s ours
am: f513923b38  -s ours

Change-Id: I281533c1337341e069c6215649d140b38c7a2029