If we've explicitly stopped the rings for testing purposes, don't ban
the default context. Fixes kms_flip hang tests.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: NMika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>