ASoC: dt-bindings: mt8192-mt6359: add hdmi-codec property

Adds optional property "hdmi-codec".

If specified, the machine driver should:
- Exposes a device that can write audio data to the DP bridge.
- Detects jack plug events.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20210120080850.699354-5-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/mt8192-mt6359-rt1015-rt5682.yaml

@@ -23,6 +23,10 @@ properties:
     $ref: "/schemas/types.yaml#/definitions/phandle"
     description: The phandle of MT8192 ASoC platform.
 
+  mediatek,hdmi-codec:
+    $ref: "/schemas/types.yaml#/definitions/phandle"
+    description: The phandle of HDMI codec.
+
 additionalProperties: false
 
 required:
@@ -35,6 +39,7 @@ examples:
     sound: mt8192-sound {
         compatible = "mediatek,mt8192_mt6359_rt1015_rt5682";
         mediatek,platform = <&afe>;
+        mediatek,hdmi-codec = <&anx_bridge_dp>;
         pinctrl-names = "aud_clk_mosi_off",
                         "aud_clk_mosi_on";
         pinctrl-0 = <&aud_clk_mosi_off>;