Make audio input fully device aware

- Create audio policies with the correct contexts
- Set the VDM audio policy to default/custom depending on the preference
- More granular start/stop of AudioStreamer and AudioInjector
- Make AudioStreamer/AudioInjector isolated to one virtual device

Bug: 291737188
Test: local
Change-Id: Ib4940b7d6eb265fb436408ea5a41ca7ae8ce80cc
4 files changed