dt-bindings: interconnect: Add EPSS L3 DT binding on SM8250

Add Epoch Subsystem (EPSS) L3 interconnect provider binding on SM8250
SoCs.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200801123049.32398-5-sibis@codeaurora.org


Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>