dt-bindings: firmware: scm: Add compatible for SDX65

Add devicetree compatible for SCM present in SDX65 platform.
Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1654080312-5408-5-git-send-email-quic_rohiagar@quicinc.com

Documentation/devicetree/bindings/firmware/qcom,scm.txt

@@ -29,6 +29,7 @@ Required properties:
  * "qcom,scm-sm6125"
  * "qcom,scm-sdm845"
  * "qcom,scm-sdx55"
+ * "qcom,scm-sdx65"
  * "qcom,scm-sm6350"
  * "qcom,scm-sm8150"
  * "qcom,scm-sm8250"