Remove permission and AppOpsManager checks for wearable hotword.

Specifically, the checks removed are the ones performed before the
sandboxed HotwordDetectionService sends the audio to the non-sandboxed
VoiceInteractionService. See the code comment in DetectorSession about
why this is needed.

Bug: 310055381
Test: Tried on device and verified that the mic indicator does not show
up when HotwordDetectionService sends wearable hotword audio to
VoiceInteractionService

Change-Id: Id4e0df1cbe74a4d46481009f43104b5369085039