Updating security string to 2016-09-01 to platform and CTS in preparation for 2016 September OTA am: 4d7c3a4c0d am: 5e9c40c879 am: d46066851f am: c8b3df9fb8 am: 46a86bf9d5 am: 984987506a
am: 2c64061e72  -s ours

Change-Id: I134b3a61251b175b01c21ee11997cf85e131308f