msm: vidc: Fix bus voting overflow issues on 32 bit platform

Q16 representation in 32 bit platform is causing variable
overflow. Replace strict 64 bit data types instead of
size_t, which ensure 64 bit allocation happen for all required
calculations.Also amended division operations with 64bit generic
function calls to support 64 bit division operation
on 32 bit platform.

Change-Id: Ib345c209f562c9d6bafc4fd98c35126905b5c02f
Signed-off-by: Srinu Gorle <sgorle@codeaurora.org>