zuul: layout: Promote the openSUSE bifrost tinyipa job to gate
zuul: layout: Promote the openSUSE bifrost tinyipa job to gate

The job is working as expected, so drop the non-voting option and
make it an official gate job.

Change-Id: I319e3cde2c91269ba1b8a3d23d688cea0e6af082

openstack-infra/project-config,openstack-infra/project-config