Rename pmInternal#getPackageUidInternal (2/4)

This method was added to operate as an internal variant of the
public getPackageUid method since pmInternal#getPackageUid already
exist. However, pmInternal#getPackageUid method just called to the
public interface, and enforcing permissions and visibility checks.

Since we don't expect any UID/permission checks in a local service,
any callers to this method requiring permission checks should be
migrated onto the PackageManager public method. Remove the original
pmInternal#getPackageUid and rename #getPackageUidInternal to take
its place.

Bug: 148235092
Test: Build pass and boot
Change-Id: Iebf51ab7f35710dea2b9c34c64138277c44cf30a