msm: camera: Validate packet params against cpu buffer length

Modifying validate packet in cam utils and its callers to provide cpu
buffer length which is used in validation of number of cmd buffers,
io configs and patches.

Change-Id: Ia180264b787bb8ab91154448809076d7c0c31e29
Signed-off-by: Mukund Madhusudan Atre <matre@codeaurora.org>
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>