Revert "Revert "Revert "Extending systemUserOnly attribute to Pr..."

Revert submission 25852019-revert-25853953-revert-25631646-systemUserOnly_manifestAttribute-HTZWDAKPKU-ZDDIDJKFQL

Reason for revert: Potential culprit for b/319931444  - 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:25852019-revert-25853953-revert-25631646-systemUserOnly_manifestAttribute-HTZWDAKPKU-ZDDIDJKFQL

Change-Id: Id02112c7b6eb1acff8b8533fa2b47ad473e21602