Passing callingUid to internal methods

Sometimes callers want to clear the calling identity [to avoid permission
calls]. In this case, allow passing the original calling identity to
internal methods.

Test: Manual; create profile account and observe launcher still works cross profile
Test: bit FrameworksServicesTests:com.android.server.pm.ShortcutManagerTest{1..10}
Change-Id: I73f8ad4b2dc1895227c3fcb14f3f1f18f600562f
Fixes: 38349978