drm/omap: drop dssdev display field

All displays are now using a drm_panel or a drm_bridge that models the
connector instead of dssdev, so this field is always 0 and can be
dropped.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-47-tomi.valkeinen@ti.com

drivers/gpu/drm/omapdrm/dss/base.c

@@ -198,7 +198,7 @@ void omapdss_device_disconnect(struct omap_dss_device *src,
 	}
 
 	if (!dst->id && !omapdss_device_is_connected(dst)) {
-		WARN_ON(!dst->display);
+		WARN_ON(1);
 		return;
 	}
 

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -301,12 +301,6 @@ struct omap_dss_device {
 	 */
 	enum omap_display_type type;
 
-	/*
-	 * True if the device is a display (panel or connector) at the end of
-	 * the pipeline, false otherwise.
-	 */
-	bool display;
-
 	const char *name;
 
 	const struct omap_dss_device_ops *ops;