Prevent some key system applications from losing storage permissions

The storage permissions of some system applications have been authorized by default and cannot be modified by users with SYSTEM_FIXED or POLICY_FIXED flags. Once revoked due to an self-upgrade package, the user cannot re-grant.

Bug: 292732635
Test: manual
Change-Id: Ifb2480fa05c281dcdf9129b453f168ed68ebfc5d