ARM: dts: msm: Introduce bus topology for sdm670

Bus topology is the representation of bus connections in SOC
and is required for the bus driver to serve the bandwidth
requests from clients.

Change-Id: Ib602c5317c27ec27223f49cf5e9840579dc80c75
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>