Fix issue #7649720: ANR occur when OTA with lower version...

...of Play Store is included

The issue is that the name of the play store apk on the system
image has changed, and the package manager has a bug when this
happens and it is being hidden by an updated version of the
application that is still a newer version.  In this case it
doesn't do the normal scan of the system apk, but just leaves
its old disabled state.  However if the code path has changed,
this will trip up other code that thinks the system apk has
disappeared (since when it checks for the existence of the apk
with the stored code path, it doesn't find anything).

The fix here is to add a special case to make sure the code
path is updated even if we are otherwise ignoring the hidden
system image package data.

Change-Id: Ic5118f94c078da7a30b53b9cadf7c9844f7ba866