interconnect: qcom: Lay the groundwork for adding EPSS support

Lay the groundwork for adding Epoch Subsystem (EPSS) L3 support on
SM8250.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20200801123049.32398-4-sibis@codeaurora.org


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