ASoC: dt-bindings: realtek,rt5640: Update jack-detect

The device-tree property 'realtek,jack-detect-source' currently only
permits values from 0-6. However, commit 2b9c8d2 ("ASoC: rt5640:
Add the HDA header support") updated the Realtek rt5640 to support
setting the 'realtek,jack-detect-source' to 7 to support the HDA header.

The Tegra234 platforms currently set 'realtek,jack-detect-source' to 7
for the HDA header and this is causing a warning when building
device-tree.

 audio-codec@1c (realtek,rt5640): realtek,jack-detect-source:
  7 is not one of [0, 1, 2, 3, 4, 5, 6]

Given that the driver already supports this settings, update the binding
document for the rt5640 device to add the HDA header as a valid
configuration for the 'realtek,jack-detect-source' property.

Fixes: 2b9c8d2 ("ASoC: rt5640: Add the HDA header support")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260108143158.351223-3-jonathanh@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: jonhunter

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

@@ -106,6 +106,7 @@ properties:
       - 4 # Use GPIO2 for jack-detect
       - 5 # Use GPIO3 for jack-detect
       - 6 # Use GPIO4 for jack-detect
+      - 7 # Use HDA header for jack-detect
 
   realtek,jack-detect-not-inverted:
     description: