ARM: dts: msm: Introduce bus topology for msm8992

Introduce bus topology for msm8992. This gives a representation of
the bus topology in software that allows the bus driver to process
bandwidth requests from different clients.

Change-Id: I594cfb8b1ad83488d15072c80aec03f18b468af7
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>