update system architecture diagram
update system architecture diagram

Change-Id: I65cf8b2b2a0c3a4d0cd71946138080a20ee2055a

mahnazhaj/iot-starterkit,mahnazhaj/iot-starterkit,mahnazhaj/iot-starterkit,mahnazhaj/iot-starterkit,iwonahahn/iot-starterkit,iwonahahn/iot-starterkit,iwonahahn/iot-starterkit,iwonahahn/iot-starterkit,iwonahahn/iot-starterkit