dt-bindings: arm: qcom: document sda660 SoC and ifc6560 board

Add binding documentation for the Inforce IFC6560 board which uses
Snapdragon SDA660.

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220521202708.1509308-11-dmitry.baryshkov@linaro.org

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -44,6 +44,7 @@ description: |
         sc7280
         sc8180x
         sc8280xp
+        sda660
         sdm630
         sdm632
         sdm660
@@ -544,6 +545,11 @@ properties:
               - qcom,sc8280xp-qrd
           - const: qcom,sc8280xp
 
+      - items:
+          - enum:
+              - inforce,ifc6560
+          - const: qcom,sda660
+
       - items:
           - enum:
               - fairphone,fp3