SoundTriggerHelper: fix state after audioserver death

Make sure mRecognitionRequested is reset when a failure
condition disables all recognitions: A stale value would
prevent from registering call and power state listeners
and properly update the states.

Also:
- In isRecognitionAllowed(), read current call and power
states directly from services if listeners are not registered.
- Also add missing null checks on mModule at various places.

Bug: 139268184
Test: repro steps in the bug
Change-Id: I763130b4d491a1a6a9e0756c7a18943e406ce73e