Merge "AudioPolicyService: Acquire mutex for SoundTriggerSession" into lmp-dev am: 35a587cdc5 am: 27c4e661d4  -s ours am: ac43fbe5a6  -s ours am: f513923b38  -s ours am: a421c87781  -s ours am: 310807ff52  -s ours am: 25c38b2f40  -s ours am: 550c14e0a4  -s ours am: 99555160ee  -s ours
am: a0fd1b9e00  -s ours

Change-Id: I008f2b8129130240954d3138ee800cc4d87845ee