msm: camera: sensor: Add (non-fatal) in logs if it fails.

Sensor probe fails for some of the non existing sensors.
This is expected. When the probe fails it prints the error logs
which is misleading. Adding (non-fatal) in log

Change-Id: I6d677f46be3b82ef4b3bee5328504b9d24ae3f9c
Signed-off-by: Rajesh Bondugula <rajeshb@codeaurora.org>