dt-bindings: arm: qcom: Document SDX65 platform and boards

Document the SDX65 platform binding and also the boards using it.
Signed-off-by: Vamsi Krishna Lanka <quic_vamslank@quicinc.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/500c75eb1bdc37ad66dc2ebd51ad21a211d9ed27.1626987430.git.quic_vamslank@quicinc.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -44,6 +44,7 @@ description: |
         sdm660
         sdm845
         sdx55
+        sdx65
         sm8150
         sm8250
         sm8350
@@ -206,6 +207,11 @@ properties:
               - qcom,sdx55-t55
           - const: qcom,sdx55
 
+      - items:
+          - enum:
+              - qcom,sdx65-mtp
+          - const: qcom,sdx65
+
       - items:
           - enum:
               - qcom,ipq6018-cp01