ASoC: dt-bindings: wcd938x: Add gpio property for selecting CTIA/OMTP headset

Add gpio property used for selecting CTIA/OMTP headset connected
to wcd codec.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Co-developed-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Signed-off-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Link: https://lore.kernel.org/r/1644668672-29790-3-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,wcd938x.yaml

@@ -23,6 +23,10 @@ properties:
     description: GPIO spec for reset line to use
     maxItems: 1
 
+  us-euro-gpios:
+    description: GPIO spec for swapping gnd and mic segments
+    maxItems: 1
+
   vdd-buck-supply:
     description: A reference to the 1.8V buck supply