Merge "audio policy: add fallback for output selection" into lmp-mr1-dev

            if (output != AUDIO_IO_HANDLE_NONE) {

                mpClientInterface->closeOutput(output);

            }

            // fall back to mixer output if possible when the direct output could not be open

            if (audio_is_linear_pcm(format) && samplingRate <= MAX_MIXER_SAMPLING_RATE) {

                goto non_direct_output;

            }

            return AUDIO_IO_HANDLE_NONE;

        }

        outputDesc->mSamplingRate = config.sample_rate;