Merge changes from topic "new-perm"

* changes:
  Demote AlwaysOnHotwordDetector to SystemApi
  Sessionize VoiceInteractionManagerService
  Sessionize the SoundTriggerService layer.
  Use standard API in SoundTriggerTestApp
  Fix bug in dumpsys
  Require identity information in SoundTrigger.java
  Associate an originator identity to sessions
  Extract permission checking as a separate aspect
  Correctly handle HAL death