Revert "AudioEffect: prevent adding effect for unknown session o..."

Revert submission 25712917

Reason for revert: Droid-monitor triggered revert likely due to breakage in b/330202134. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:25712917

Change-Id: I8b5a30920d54f1ebf49d0073426150933f057398
7 files changed