msm: camera: cpp: Add validation for v4l2 ioctl arguments

In CPP v4l2 ioctl command is made, if _IOC_DIR(cmd) is
_IOC_NONE, then the user-supplied argument arg is not checked
and an information disclosure is possible.

CRs-Fixed: 1042068
Change-Id: Iddb291b10cdcb5c42ab8497e06c2ce47885cd5ab
Signed-off-by: Sunid Wilson <sunidw@codeaurora.org>