Reintroduce internal variant of getComponentEnabledSetting

The *Internal variant of the getComponentEnabledSetting call was removed
in ag/16176950, which was an oversight. This change adds it back to
avoid unnecessary permission checks on calls to
PackageManagerInternal#getComponentEnabledSetting.

Fixes: 206734531
Change-Id: Ifab64bb18960cc504c97a63f46d621bdb812732a