arm64: dts: qcom: sc8280xp: Add missing SCM interconnect

The SCM interconnect path was missing. Add it.

Fixes: 152d1faf ("arm64: dts: qcom: add SC8280XP platform")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20230622-topic-8280scmicc-v1-2-6ef318919ea5@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>