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

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

These two bindings are almost identical, so combine them into one. This
will make it easier to add the sm8150 and sm8250 interconnect bindings.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200728023811.5607-2-jonathan@marek.ca
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>