dt-bindings: display: synopsys, dw-hdmi: Mark ddc-i2c-bus as deprecated

The ddc-i2c-bus property should be placed in connector node,
mark the HDMI TX side property as deprecated.
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522000949.49530-1-marex@denx.de

Documentation/devicetree/bindings/display/bridge/synopsys,dw-hdmi.yaml

@@ -47,12 +47,17 @@ properties:
 
   ddc-i2c-bus:
     $ref: /schemas/types.yaml#/definitions/phandle
+    deprecated: true
     description:
       The HDMI DDC bus can be connected to either a system I2C master or the
       functionally-reduced I2C master contained in the DWC HDMI. When connected
       to a system I2C master this property contains a phandle to that I2C
       master controller.
 
+      This property is deprecated, the system I2C master controller should
+      be referenced through the ddc-i2c-bus property of the HDMI connector
+      node.
+
   interrupts:
     maxItems: 1