Base: On-The-Go: Change the way of changing the camera mode

changing it on the fly is too buggy like i have done it.
sometimes things fail and we are getting stuck ;P

on mode change, save the value, create a notification and stop the service.
the notification allows to restart the service.

Change-Id: Ie02f01a4ab2f856cd58fe5fde8c49220bf7efd4b