dt-bindings: display: Fix graph 'unevaluatedProperties' related warnings

The graph schema doesn't allow custom properties on endpoint nodes for
'#/properties/port' and '#/$defs/port-base' should be used instead. This
doesn't matter until 'unevaluatedProperties' support is implemented.

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: Marek Vasut <marex@denx.de>
Cc: Krishna Manikandan <mkrishn@codeaurora.org>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://lore.kernel.org/r/20210719195001.2412345-1-robh@kernel.org

Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml

@@ -37,7 +37,8 @@ properties:
 
     properties:
       port@0:
-        $ref: /schemas/graph.yaml#/properties/port
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
         description: Video port for MIPI DSI Channel-A input
 
         properties:
@@ -57,7 +58,8 @@ properties:
                   - const: 4
 
       port@1:
-        $ref: /schemas/graph.yaml#/properties/port
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
         description: Video port for MIPI DSI Channel-B input
 
         properties:

Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml

@@ -77,7 +77,8 @@ properties:
 
     properties:
       port@0:
-        $ref: "/schemas/graph.yaml#/properties/port"
+        $ref: "/schemas/graph.yaml#/$defs/port-base"
+        unevaluatedProperties: false
         description: |
           Input endpoints of the controller.
         properties:
@@ -92,7 +93,8 @@ properties:
                   enum: [ 0, 1, 2, 3 ]
 
       port@1:
-        $ref: "/schemas/graph.yaml#/properties/port"
+        $ref: "/schemas/graph.yaml#/$defs/port-base"
+        unevaluatedProperties: false
         description: |
           Output endpoints of the controller.
         properties: