ASoC: dt-bindings: audio-graph-port: add definitions/ports

Audio Graph user needs "ports" not only "port".
This patch adds standard "ports" as definitions to use it easily.

If user needs standard "ports", it can use

   ports:
     $ref: audio-graph-port.yaml#/definitions/ports

If user want to use custom ports, it can re-use
audio-graph-port.yaml#/definitions/port-base"
audio-graph-port.yaml#/definitions/endpoint-base"

Link: https://lore.kernel.org/r/87sfhipynv.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pmb57rh2.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/audio-graph-port.yaml

@@ -97,6 +97,18 @@ definitions:
               minimum: 1
               maximum: 64
 
+  ports:
+    $ref: "#/definitions/port-base"
+    unevaluatedProperties: false
+    patternProperties:
+      "^port(@[0-9a-f]+)?$":
+        $ref: "#/definitions/port-base"
+        unevaluatedProperties: false
+        patternProperties:
+          "^endpoint(@[0-9a-f]+)?":
+            $ref: "#/definitions/endpoint-base"
+            unevaluatedProperties: false
+
 allOf:
   - $ref: "#/definitions/port-base"