Use the new audio_port_config.flags field

- When filling out audio_port_config from AudioPortConfig and
  AudioFlinger's threads, populate audio_port_config.flags when needed.

- When creating software patches, apply the flags provided
  in audio_port_config_flags to the created threads.

Bug: 63901775
Test: use USB headset for telephony on sailfish
Change-Id: I7704797a84427f7a9431e5132b8f5c51538f9217