drm/rcar-du: use drm_crtc_send_vblank_event()

Replace the legacy drm_send_vblank_event() with the new helper function.

Signed-off-by: Gustavo Padovan <[e-mail]>
Acked-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

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

···
 		return;
 
 	spin_lock_irqsave(&dev->event_lock, flags);
-	drm_send_vblank_event(dev, rcrtc->index, event);
+	drm_crtc_send_vblank_event(&rcrtc->crtc, event);
 	wake_up(&rcrtc->flip_wait);
 	spin_unlock_irqrestore(&dev->event_lock, flags);