Merge "Revert "Revert "audio policy: bind setMode() and setPhoneState()...

    ALOGV("setPhoneState()");

    // acquire lock before calling setMode() so that setMode() + setPhoneState() are an atomic

    // operation from policy manager standpoint (no other operation (e.g track start or stop)

    // can be interleaved).

    Mutex::Autolock _l(mLock);

    // TODO: check if it is more appropriate to do it in platform specific policy manager

    AudioSystem::setMode(state);

    Mutex::Autolock _l(mLock);

    mAudioPolicyManager->setPhoneState(state);

    mPhoneState = state;

    return NO_ERROR;