dt-bindings: display: adi,adv75xx: Add missing graph schema references

DT bindings using the graph binding must have references to the graph
binding schema. These are missing from the adi,adv7511 and adi,adv7533
bindings, so add them.
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20220823145649.3118479-12-robh@kernel.org

Documentation/devicetree/bindings/display/bridge/adi,adv7511.yaml

@@ -117,23 +117,21 @@ properties:
 
   ports:
     description:
-      The ADV7511(W)/13 has two video ports and one audio port. This node
-      models their connections as documented in
-      Documentation/devicetree/bindings/media/video-interfaces.txt
-      Documentation/devicetree/bindings/graph.txt
-    type: object
+      The ADV7511(W)/13 has two video ports and one audio port.
+    $ref: /schemas/graph.yaml#/properties/ports
+
     properties:
       port@0:
         description: Video port for the RGB or YUV input.
-        type: object
+        $ref: /schemas/graph.yaml#/properties/port
 
       port@1:
         description: Video port for the HDMI output.
-        type: object
+        $ref: /schemas/graph.yaml#/properties/port
 
       port@2:
         description: Audio port for the HDMI output.
-        type: object
+        $ref: /schemas/graph.yaml#/properties/port
 
 # adi,input-colorspace and adi,input-clock are required except in
 # "rgb 1x" and "yuv444 1x" modes, in which case they must not be

Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml

@@ -91,25 +91,23 @@ properties:
 
   ports:
     description:
-      The ADV7533/35 has two video ports and one audio port. This node
-      models their connections as documented in
-      Documentation/devicetree/bindings/media/video-interfaces.txt
-      Documentation/devicetree/bindings/graph.txt
-    type: object
+      The ADV7533/35 has two video ports and one audio port.
+    $ref: /schemas/graph.yaml#/properties/ports
+
     properties:
       port@0:
         description:
           Video port for the DSI input. The remote endpoint phandle
           should be a reference to a valid mipi_dsi_host_device.
-        type: object
+        $ref: /schemas/graph.yaml#/properties/port
 
       port@1:
         description: Video port for the HDMI output.
-        type: object
+        $ref: /schemas/graph.yaml#/properties/port
 
       port@2:
         description: Audio port for the HDMI output.
-        type: object
+        $ref: /schemas/graph.yaml#/properties/port
 
 required:
   - compatible