Note RECEIVE_AMBIENT_TRIGGER_AUDIO in the SoundTrigger

This op gets around the background restrictions on RECORD_AUDIO, when
used for SoundTrigger detection
In addition, moves the precise logic for soundtrigger RECORD_AUDIO
checks out of the soundtrigger system

Fixes: 230430779
Test: manual
Change-Id: I6d63c99e2d31e3f668070ac82afed71ff6672c9e
Merged-In: I6d63c99e2d31e3f668070ac82afed71ff6672c9e