Merge "AudioPolicyService: fix race in AudioCommandThread" into mnc-dev am: 81fe612e61 am: d3783a4b2a am: c0661e0ae4
am: 3447b54bcc

* commit '3447b54bcc4f6a061d3e2927419d88d1066992d6':
  AudioPolicyService: fix race in AudioCommandThread