msm: camera: Fix for OOB security CR

If user passes an aribitary command with _IOC_DIR(cmd) == _IOC_NONE,
"arg" should point to any arbitrary address.

Check for invalid command and return error.

Change-Id: If60191a07bb80939af2d471a5acf1b17dd68aa58
CRs-Fixed: 2299567
Signed-off-by: Abhishek Abbanaveni <aabban@codeaurora.org>