msm: camera: isp: Increase max count of cfg to support more init packets

Increase maximum count of command buffers in a request to support
more number of init packets.

CRs-Fixed: 2652124
Change-Id: I6c85cf5720076c09350b952bc09ed30fbcf27497
Signed-off-by: Rishabh Jain <risjai@codeaurora.org>