drm/arc: Don't set the dpms hook

Doesn't do anything for atomic.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20181217194303.14397-5-daniel.vetter@ffwll.ch

drivers/gpu/drm/arc/arcpgu_sim.c

@@ -51,7 +51,6 @@ arcpgu_drm_connector_helper_funcs = {
 };
 
 static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
-	.dpms = drm_helper_connector_dpms,
 	.reset = drm_atomic_helper_connector_reset,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = arcpgu_drm_connector_destroy,