msm: camera: ope: Add a check to validate dmi cmd address

Add a check to validate DMI command address before writing
DMI in command buffer. This can avoid cdm doing null pointer
de-reference.

CRs-Fixed: 2664479
Change-Id: If99da6fd23f73c1c666cdcec60b0f68eb300425e
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>