drm/udl: Clear struct drm_connector_funcs.dpms

Atomic modesetting doesn't use struct drm_connector_funcs.dpms and
the set function, drm_helper_connector_dpms(), wouldn't support it
anyway. So keep the pointer to NULL.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200207141602.4760-2-tzimmermann@suse.de

drivers/gpu/drm/udl/udl_connector.c

@@ -109,7 +109,6 @@ static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 };
 
 static const struct drm_connector_funcs udl_connector_funcs = {
-	.dpms = drm_helper_connector_dpms,
 	.reset = drm_atomic_helper_connector_reset,
 	.detect = udl_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,