drm: rcar-du: Remove unnecessary include

rcar_du_regs.h is not needed by rcar_du_drv.c so drop the include.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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

@@ -27,7 +27,6 @@
 
 #include "rcar_du_drv.h"
 #include "rcar_du_kms.h"
-#include "rcar_du_regs.h"
 
 /* -----------------------------------------------------------------------------
  * Device Information