dt-bindings: interconnect: Add Qualcomm SM8350 DT bindings

The Qualcomm SM8350 platform has several bus fabrics that could be
controlled and tuned dynamically according to the bandwidth demand.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210318094617.951212-2-vkoul@kernel.org
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>