Always allow the system to launch stuff on VDs.

This fixes AAOS tests that think that user 0 is disallowed.

Also fixing a bunch of logs in GWPC test like:
"Timed out while waiting for GWPC displayId to be set."

Fix: 330922390
Test: atest GenericWindowPolicyControllerTest w/ cf_x86_64_only_auto_md-trunk_staging-userdebug
Change-Id: I3960f396b752ec1044538830aec9bbc7d2f71ead