dt-bindings: interconnect: document the RPMh Network-On-Chip Interconnect in Qualcomm SM8650 SoC

Document the RPMh Network-On-Chip Interconnect of the SM8650 platform.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231123-topic-sm8650-upstream-interconnect-v2-1-7e050874f59b@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>