linux-imx

video: Add DT bindings for the R-Car Display Unit

Aside of the usual boring core properties (compatible, reg, interrupts
and clocks), the bindings use the OF graph bindings to model connections
between the DU output video ports and the on-board and off-board
components.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>