ASoC: dt-bindings: realtek,rt5640: Add missing properties/node

The RT5640 has an MCLK pin and several users already define a clocks
entry. A 'port' node is also in use and a common node for codecs.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260108215307.1138515-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/realtek,rt5640.yaml

@@ -47,6 +47,12 @@ properties:
   reg:
     maxItems: 1
 
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: mclk
+
   interrupts:
     maxItems: 1
     description: The CODEC's interrupt output.
@@ -121,6 +127,9 @@ properties:
       - 2 # Scale current by 1.0
       - 3 # Scale current by 1.5
 
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+
 required:
   - compatible
   - reg