Merge "AudioFlinger: dumpsys of audio mutexes held" into main

        // dump mutex stats

        const auto mutexStats = audio_utils::mutex::all_stats_to_string();

        write(fd, mutexStats.c_str(), mutexStats.size());

        // dump held mutexes

        const auto mutexThreadInfo = audio_utils::mutex::all_threads_to_string();

        write(fd, mutexThreadInfo.c_str(), mutexThreadInfo.size());

    }

    return NO_ERROR;

}