drm: rcar-du: Remove unused CRTC suspend/resume functions

An early implementation of suspend-resume helpers are available in the
CRTC module, however they are unused and no longer needed.

With suspend and resume handled by the core DRM atomic helpers, we can
remove the unused functions.
Signed-off-by: NKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_crtc.c

@@ -557,41 +557,6 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
 	rcar_du_group_start_stop(rcrtc->group, false);
 }
 
-void rcar_du_crtc_suspend(struct rcar_du_crtc *rcrtc)
-{
-	if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
-		rcar_du_vsp_disable(rcrtc);
-
-	rcar_du_crtc_stop(rcrtc);
-	rcar_du_crtc_put(rcrtc);
-}
-
-void rcar_du_crtc_resume(struct rcar_du_crtc *rcrtc)
-{
-	unsigned int i;
-
-	if (!rcrtc->crtc.state->active)
-		return;
-
-	rcar_du_crtc_get(rcrtc);
-	rcar_du_crtc_setup(rcrtc);
-
-	/* Commit the planes state. */
-	if (!rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE)) {
-		for (i = 0; i < rcrtc->group->num_planes; ++i) {
-			struct rcar_du_plane *plane = &rcrtc->group->planes[i];
-
-			if (plane->plane.state->crtc != &rcrtc->crtc)
-				continue;
-
-			rcar_du_plane_setup(plane);
-		}
-	}
-
-	rcar_du_crtc_update_planes(rcrtc);
-	rcar_du_crtc_start(rcrtc);
-}
-
 /* -----------------------------------------------------------------------------
  * CRTC Functions
  */