am e506084e: am ab9071b8: audioflinger: fix active sleep time calculation.

uint32_t AudioFlinger::PlaybackThread::activeSleepTimeUs() const

{

    // A2DP output latency is not due only to buffering capacity. It also reflects encoding,

    // decoding and transfer time. So sleeping for half of the latency would likely cause

    // underruns

    if (audio_is_a2dp_device((audio_devices_t)mDevice)) {

    return (uint32_t)((uint32_t)((mNormalFrameCount * 1000) / mSampleRate) * 1000);

    } else {

        return (uint32_t)(mOutput->stream->get_latency(mOutput->stream) * 1000) / 2;

    }

}

status_t AudioFlinger::PlaybackThread::setSyncEvent(const sp<SyncEvent>& event)