arm64: dts: renesas: falcon-cpu: Add DSI display output

Provide the display output using the sn65dsi86 MIPI DSI bridge.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20211130164311.2909616-3-kieran.bingham+renesas@ideasonboard.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>