Never generate synthetic AppInfo activity for any system app

A check was missed in one place, when the API was called with
specific packageName, which meant we were generating synthetic
AppInfo activity for gmscore.

Bug: 119097715
Test: manual, CTS for the whole feature on the way
Change-Id: I8c123eaf8ee28fca828268cf049d9c08e9e7409c
1 file changed