Implement silencing of audio capture for idle UIDs for
MMAP streams.
Use audio HAL setMicGain() API to silence the mmap buffer for
exclusive mode and when only one client is active in shared mode.
Add new MmapStreamCallback method onStreamSilenced() for AAudio
service to selectively silence streams from silenced UIDs in
shared mode.
Bug: 72134552
Test: manual
Change-Id: I7c92ba0002bc5ba003c1a3c887edddf9ae53b538
Added definition of MmapStreamInterface used by Oboe service
to open, configure and control MMAP streams at the audio HAl.
This interface is implemented by audioflinger and abstracts the details
of interacting with audio policy manager and audio HAL from Oboe service.
A callback interface MmapStreamCallback is also defiend to communicate
volume and routing changes back to Oboe service.
Bug: 33398120
Test: build
Change-Id: If953d44903aaa4eb17ff16f1922ca16e5e0e0a87
Eric Laurent