msm: camera: sensor:validating the flash initialization parameters

Copying the flash initialization parameters from userspace memory to
kernel memory and in turn checking for the validity of the flash
initialization parameters pointer sent from userspace

CRs-Fixed: 2059812
Change-Id: I957c10959108eb08b263d439a9a449b90338b6db
Signed-off-by: kaiwang <kaiwang@codeaurora.org>
Signed-off-by: Haibin Liu <haibinl@codeaurora.org>