Protect against TOC/TOU bugs in soundtrigger

Test: Ran the repro program vendor/google_toolbox/user/ytai/SoundTriggerPoc
Test: Manual verification that soundtrigger still works for hotword and music.
Fixes: 136005905

Change-Id: Icdfe5a823ba02eb7bd8c41f0fa503c9922d8f348
(cherry picked from commit ea51ad6e)
Merged-In: Icdfe5a823ba02eb7bd8c41f0fa503c9922d8f348