msm: vidc: add new control for limiting i/p buffer size

Take the minimum of the size calculated by driver using
max width and height supported and the size set by client
for input buffers. Change interface to get input and
output buffer sizes.

Change-Id: Ia3eb4cc7ae7bb38e2650fff1b694623e2aab62ef
Signed-off-by: Pushkaraj Patil <ppatil@codeaurora.org>