tests: Move name tables to libutil

These tables are duplicated in several places, so move them into libutil
so that they can be shared.

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>