dt-bindings: display: bridge: it6505: Add #sound-dai-cells

The ITE IT6505 display bridge can take one I2S input and transmit it
over the DisplayPort link.

Add #sound-dai-cells (= 0) to the binding for it.
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240327085250.3427496-1-wenst@chromium.org

Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml

@@ -9,6 +9,9 @@ title: ITE it6505
 maintainers:
   - Allen Chen <allen.chen@ite.com.tw>
 
+allOf:
+  - $ref: /schemas/sound/dai-common.yaml#
+
 description: |
   The IT6505 is a high-performance DisplayPort 1.1a transmitter,
   fully compliant with DisplayPort 1.1a, HDCP 1.3 specifications.
@@ -52,6 +55,9 @@ properties:
     maxItems: 1
     description: extcon specifier for the Power Delivery
 
+  "#sound-dai-cells":
+    const: 0
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
 
@@ -105,7 +111,7 @@ required:
   - extcon
   - ports
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |