msm: vidc: Calculate internal buffer sizes within driver

Right now we get internal buffer requirements from fw. The
call to get these requirements is a blocking call and takes
a lot of time. This change calculates all the internal
buffer requirement within driver and this removes the
necessity for get buffer requirements call.

CRs-Fixed: 2368458
Change-Id: Ib0e6feb800be74891eb3ecbc3cf854348f2f19f7
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>