The fence and mapped-buffer tests both use the VIMC test device and must
not be run at the same time.
Split these tests to a new group to force their isolation from running
in parallel.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>