RESTRICT AUTOMERGE Disable the Trusted Hotword requirement

The requirement to use a sandboxed HotwordDetectionService to avoid
incurring the mic indicator will be added back in a future release.
With this change, SoundTrigger events and hotword-source audio do not
incur the mid indicator for any process.

This change adds back the permissions logic from
I3275647d0f9a6e3ce8b97a556f56723b49170c8e, adjusted to account for the
changes from I4fc3b3e8defed59a900fd156273e9e695a322b0c (preflight
permission checks were made to accept soft denials, so simply reusing
enforcePermissionForPreflight does not work anymore - it would pop up a
dialog if the mic sensor is muted).

We preserve the behavior of showing the indicator when the detected
event is delivered from the Trusted Hotword process (no false-positives
here, so we can accurately show it).

Fix: 197034852
Test: manual - dsp and non-dsp; true and false positives; mute mic
 sensor - events aren't delivered and no dialog is shown, hotword still
 works after unmuting; mute mic and restart, unmute after starting reco;
 Trusted and non-Trusted hotwording
Test: atest CameraMicIndicatorsPermissionTest
Test: atest HotwordDetectionServiceBasicTest
Test: atest android.cts.statsdatom.appops.AppOpsTests#testAppOps
Change-Id: I68f2f37b5ce835e7fd8649b382eaee9fc299ec79