Require identity information in SoundTrigger.java

Deprecate the way to attach to SoundTrigger that doesn't include
identity information. Plumb that up to the SoundTriggerService layer,
where it is temporarily provided in a backward-compatible way instead
of with the actual identity.

Change-Id: Icc2bf3b80300bd2b75c81d253986b4e1582737ca
Bug: 163865561