audio policy: fix several problems with capture policy

- Fix accessibility service not able to get same policy as regular apps
when not using VOICE_RECOGNITION source b/126785297
- Make sure two captures from same app do not silence each other
(e.g two privacy sensitive captures concurrently)
- Ignore clients in idle state when considering priority active clients in
silencing logic.
- Prevent capture while in call if privileged permission CAPTURE_AUDIO_OUTPUT
is not granted
- Allow capture concurrently with privacy sensitive capture or call if
permission CAPTURE_AUDIO_OUTPUT is granted.
- Do not silence virtual sources when sensor privacy is enabled.
- Consider system persistent service as top app state.

Bug: 128419018
Bug: 126785297
Test: audio smoke tests
Change-Id: I7f8c7c511c674d4d46a815eaa7e9cf95e95cc3f9