Add AUDIO_POLICY_OUTPUT_FLAG_FAST

    AUDIO_POLICY_OUTPUT_FLAG_NONE = 0x0,    // no attributes

    AUDIO_POLICY_OUTPUT_FLAG_DIRECT = 0x1,  // this output directly connects a track to one output

                                            // stream (no software mixer)

    AUDIO_POLICY_OUTPUT_FLAG_PRIMARY = 0x2  // this output is the primary output of the device.

    AUDIO_POLICY_OUTPUT_FLAG_PRIMARY = 0x2, // this output is the primary output of the device.

                                            // it is unique and must be present. it is opened by

                                            // default and receives routing, audio mode and

                                            // volume controls related to voice calls.

    AUDIO_POLICY_OUTPUT_FLAG_FAST = 0x4,    // output supports "fast tracks", defined elsewhere

} audio_policy_output_flags_t;

/* device categories used for audio_policy->set_force_use() */