No need to differentiate package event into app or updated based on

a package is being updated or not

Package update handling is a super set of package add handling  which
also updates the all-apps and package disabled state.
This also prevents addtion of a home screen icon when a managed profile
app on SD card become available.

Bug: 27877926
Change-Id: I9264e422fd30b94ce6ebb2e5adea820b3cda3063
(cherry picked from commit 144154d4)