Revert "Allow admin flags to be used in PermissionController"

Revert submission 30578537-admin-flag-export

Reason for revert: Likely culprit for b/381215589  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:30578537-admin-flag-export

Change-Id: I1cb1292467f351a0711a204f11a905989f21f164