preinstalled-packages-platform for profiles

Wallpaper packages are not needed on profiles.
This cl unwhitelists them, so that these system packages will
not be pre-installed on profile users.

Bug: 134605778
Test: Confirmed that the xml files appeared on device and that the
packages were not preinstalled
Change-Id: I39f877590f9853ae3b9c7271947947f0424da3ae