ARM: dts: imx53-tx53: add IPU DI ports and endpoints

With the recent imx-drm device tree binding changes, we need to add IPU
DI ports and endpoints for adapting.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Lothar Waßmann <LW@KARO-electronics.de>