msm: camera: utils: Add command buffer validation for reg dump

The command buffer obtained from user has several offsets and
sizes that need to be validated before accessing data. Also,
out buffer offsets need to be checked before writing data.
Add validation checks for parameters in command buffer for
reg dump.

CRs-Fixed: 2501003
Change-Id: I65b37befcefbd7f739663b6142d5d0eedcab25b4
Signed-off-by: Mukund Madhusudan Atre <matre@codeaurora.org>