dt-bindings: arm: qcom: document SM8650 and the reference boards

Document the SM8650 SoC and based MTP (Mobile Test Platforms) and QRD
(Qualcomm Reference Device) boards.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231130-topic-sm8650-upstream-dt-v5-1-b25fb781da52@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -87,6 +87,7 @@ description: |
         sm8350
         sm8450
         sm8550
+        sm8650
 
   The 'board' element must be one of the following strings:
 
@@ -1039,6 +1040,12 @@ properties:
               - qcom,sm8550-qrd
           - const: qcom,sm8550
 
+      - items:
+          - enum:
+              - qcom,sm8650-mtp
+              - qcom,sm8650-qrd
+          - const: qcom,sm8650
+
   # Board compatibles go above
 
   qcom,msm-id: