Deprecate Intent based installation/uninstallation

The android.content.pm.PackageInstaller install + uninstall APIs are
fully functional. No need to try to keep the intent based APIs
feature compatible.

In the future we will be able to restrict app targeting old targetSDK
levels from using the intent-based API. Even further in the future we
can radically simplify the package installer app.

Fixes: 116616700
Test: Built
Change-Id: Ia225d70fbee3fa31a3c1de388dcb05ff1063dccd