msm: vidc: set max output buffers to 32 in slice delivery mode

Video driver rejected the session if max output buffers configured
exceeded 32. This change overrides firmware/client set buffer count,
if higher than 32 and continues the session in best effort mode.

Change-Id: Ie2beed92dfe9e57340992c800f8c8781ef5b8b1d
CRs-fixed: 487232
Signed-off-by: Ashray Kulkarni <ashrayk@codeaurora.org>