media: dt-bindings: media: video-interfaces: Add new bus-type

No properly bus-type for DPI video bus, add bus-type 7 for it.
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NXin Ji <xji@analogixsemi.com>
Reviewed-by: NRobert Foss <robert.foss@linaro.org>
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>

Documentation/devicetree/bindings/media/video-interfaces.yaml

@@ -93,6 +93,7 @@ properties:
       - 4 # MIPI CSI-2 D-PHY
       - 5 # Parallel
       - 6 # BT.656
+      - 7 # DPI
     description:
       Data bus type.