Merge "SoundPool: Fix stream playback thread startup wait" into rvc-dev am: dc828817

    int64_t waitTimeNs = kWaitTimeBeforeCloseNs;

    std::unique_lock lock(mStreamManagerLock);

    while (!mQuit) {

        if (mRestartStreams.empty()) { // on thread start, mRestartStreams can be non-empty.

            mStreamManagerCondition.wait_for(

                    lock, std::chrono::duration<int64_t, std::nano>(waitTimeNs));

        }

        ALOGV("%s(%d) awake", __func__, id);

        sanityCheckQueue_l();