Cleanup of the PackageInstaller API - Settings

The PackageInstaller app manages side-loading apps as well
as permission management. It should be updatable, hence
should rely on system APIs to talk to the platform. This
is the first step of defining an API boundary.

Change-Id: Ibb21114a7a9fa28f6db68492fe37c02c1b2f0c6b
3 files changed