Add AppOps listening to STService

Listen for RECORD AppOp revocations for SoundTrigger clients,
pause recognition if they enter MODE_IGNORED, and resume recognition
after MODE_GRANTED.

Bug: 272147641
Fixes: 267960430
Fixes: 274960506
Test: AlwaysOnHotwordDetectorTest#
    testAppOpsLostReacquired_recognitionPausedResumed
Test: Manual verification of pause/resume flow when mic blocked
Test: Manual verification of pause/resume when booted w/ mic blocked
Change-Id: Ie907a46c9503ec163d466914f84e34c494ffd8d7