Don't callback twice for app op changes in PermissionPolicyService.

If an app op change is made while syncing app ops from permissions, we
know it's being set to our desired state and don't need to be notified
again. This cuts the performance cost to at least half of what it was,
and prevents potential looping.

Bug: 136503238
Bug: 147673896
Bug: 146039935
Bug: 148706747
Test: manual
Change-Id: I643472800c0dfbf96c202093a697f0a72eee0780