Call into permission system with cleared binder identity

These methods are called when an app posts a notification
and cannot be called with the app's context

Test: enable the permission migration and post a notification
from a non-system app; atest PermissionHelperTest
Bug: 194833441

Change-Id: Ie19ccf0098b5bb93b9d192f4bdece7f1a689bab8
1 file changed