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