dt-bindings: arm: qcom: Document the HDK8650 board

Document the Qualcomm SM8650 based HDK (Hardware Development Kit)
embedded development platform designed by Qualcomm and sold by Lantronix [1].

[1] https://www.lantronix.com/products/snapdragon-8-gen-3-mobile-hardware-development-kit/Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240422-topic-sm8650-upstream-hdk-v4-1-b33993eaa2e8@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -1009,6 +1009,7 @@ properties:
 
       - items:
           - enum:
+              - qcom,sm8650-hdk
               - qcom,sm8650-mtp
               - qcom,sm8650-qrd
           - const: qcom,sm8650