Revert "Expand HDS API to allow egressing training data"

This reverts commit 33109c19896591c9a700374e520baa5b68936277.
Revert Reason: Deprecate trusted fed-hot.

Change-Id: I762ec32a31c3c587c84667d14113a8e600415ed9
Test: atest CtsVoiceInteractionTestCases:HotwordDetectionServiceBasicTest
Bug:291656263,322391277
22 files changed