ARM: dts: msm: camera: Add AHB bus vectors

Add the supported AHB bus voltage levels and frequencies
in 8996. camera drivers can extract these values and
accordingly vote for AHB based on usecase.

Change-Id: I0bbeb75639d5cf04b3cdc525f63d39a80c391b55
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>