msm: camera: isp: Move bw voting functions to common file for vfe

Currently, vfe top has different files for different targets. Some of
the APIs are unchanged between these files. In order to avoid duplication
of code and make sure no change is missed between different versions of
vfe top, a common file is added to vfe top for unchanged APIs. With the
common top, number of input resources are moved to architecture specific
header files to ensure special conditions need not be created for a
particular architecture in common code. Move bw voting related APIs to
this common file.

Change-Id: Ibcb9519a206c25d42c9e7f0336f8d588a8240717
Signed-off-by: Mukund Madhusudan Atre <matre@codeaurora.org>