dt-bindings: interconnect: Add Qualcomm MSM8916 DT bindings

The Qualcomm MSM8916 platform has several bus fabrics that could be
controlled and tuned dynamically according to the bandwidth demand.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>