msm: vidc: Fix buffer requirement negotiations

Call buffer requirements before setting the min buffer size to
FW. Otherwise, in the case of event Sufficient, FW will
use outdated buffer size and error out. While at it, additional
buffer requirement call is added to get Output2 buffer requirement
in 10-bit case.

CRs-Fixed: 2066658
Change-Id: Iaa61aa550faa926f337c4a3f9e353c6396fe80c7
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>