ASoC: dt-bindings: realtek,rt5640: Allow 7 for realtek,jack-detect-source

The driver accepts and uses a value of 7 for realtek,jack-detect-source.
What exactly it means isn't clear though.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260108215307.1138515-2-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: robherring

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

@@ -104,6 +104,7 @@ properties:
       - 4 # Use GPIO2 for jack-detect
       - 5 # Use GPIO3 for jack-detect
       - 6 # Use GPIO4 for jack-detect
+      - 7 # HDA?
 
   realtek,jack-detect-not-inverted:
     description: