ASoC: dt-bindings: qcom,sm8250: Add Fairphone 4 sound card

Document the bindings for the sound card on Fairphone 4 which uses the
older non-audioreach audio architecture.

Acked-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Luca Weiss <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: lweiss-fairphone

Documentation/devicetree/bindings/sound/qcom,sm8250.yaml

@@ -28,6 +28,7 @@ properties:
               - qcom,sm8750-sndcard
           - const: qcom,sm8450-sndcard
       - enum:
+          - fairphone,fp4-sndcard
           - fairphone,fp5-sndcard
           - qcom,apq8096-sndcard
           - qcom,qcm6490-idp-sndcard