msm: camera: sensor: TOCTOU error handling in eeprom

IO config can be modified due to access to shared memory.
This change scopes the data locally so as to avoid
vulnerability of count being modified by external
means while executing due to being in shared memory.

CRs-Fixed: 3777635
Change-Id: Ia5dd9138dcf8449e2d800aca9ffed73d9c4ba3ea
Signed-off-by: Akash Puliyadi Jegannathan <quic_apuliyad@quicinc.com>
(cherry picked from commit 4cab684d)