dt-bindings: firmware: qcom-scm: Add interconnects property

Add interconnects as an optional property for SM8450 SoCs.
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1653289258-17699-2-git-send-email-quic_sibis@quicinc.com

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

@@ -46,6 +46,7 @@ Required properties:
   clock and "bus" for the bus clock per the requirements of the compatible.
 - qcom,dload-mode: phandle to the TCSR hardware block and offset of the
 		   download mode control register (optional)
+- interconnects: Specifies the bandwidth requirements of the SCM interface (optional)
 
 Example for MSM8916: