Expose PackageManagerLocal earlier for system components to use.

The new permission service would like to consistently use
PackageManagerLocal to access package information, but that is needed
when the internal storage volume is scanned in the
PackageManagerService constructor. So move the exposure of
PackageManagerLocal from PackageManagerService main() to constructor
where PackageManagerInternal is also exposed.

Bug: 252884423
Test: presubmit
Change-Id: I2f2569fb6e83f7c3efdc6fcfd92374220d1dec18