Bug fix: fix System crash due to NullPointerException.

If the voice interaction doesn't set RecognitionService, it may cause
NPE when it tries to get recognizer name. We don't need recognizer
name since Android 12, we delete it directly. To avoid the app does
not set RecognitionService then updating the app to earlier platform
that may cause boot loop. We add a warning log and set empty service
for voiceinteraction to let app aware the problem. Also logging and
unset the voiceinteraction service if the app try to update the app
without recognition service.

Bug: 170742278
Test: Use sample VoiceInteractionService without a RecognitionService
The system doesn't crash when choosing the sample app as the default
assistant app from Settings. And make sure the VoiceInteractionService
is unset.
Test: Install sample VoiceInteractionService with a RecognitionService
and then update it without a RecognitionService. Make sure the voice
interaction service is unset.

Change-Id: I79ab3d6449984ead0be28a94adaad57ab24d1fb9