Fix potential deadlock in restorePermissionState().

The call to retrieve all shared user packages was on the
PackageSetting object and was lockless, however it was replaced with a
PackageManagerInternal call in ag/16740473 and the method may take a
lock. This creates a potential deadlock because we are already holding
our own lock in some cases, and we shouldn't allow calling another
system service while holding it.

This change makes revokeUnusedSharedUserPermissionsLocked() re-use the
uidRequestedPermissions that we calculated earlier, and the behavior
of the method remains unchanged.

Bug: 216207402
Test: presubmit
Change-Id: I4b031cb670a6921bfa1425fff65f58cd28af576e