dt-bindings: interconnect: single yaml file for RPM interconnect drivers

MSM8916 and QCS404 bindings are almost identical, so combine them into one.
This will make it easier to add interconnect bindings for more SoC with RPM.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201204075345.5161-4-jun.nie@linaro.org


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