msm:camera: Fix overflow issue in ioctl_hw_cmds function

'len' is of type signed int 32bit,but the assigned value
 may exceed maximum unsigned int32 range.Add overflow check
 and graceful exit if 'm'exceeds UINT32_MAX value.

Bug: 11518040
Signed-off-by: Apurva Rajguru <arajguru@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>