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

Change-Id: Icce72413eaf703145c4e0478926839476df79588