Remove scanFile argument

In several locations we were passing both a parsed Package object
and a scanFile File object. But, the Package object was parsed from
the scanFile! Instead, just pass the singular Package object and
pull the scanned file from it.

Bug: 63539144
Test: bit FrameworksServicesTests:com.android.server.pm.
Change-Id: Ibd200fb567e005869de61d9c123f211fa9a38f0a