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
am: f1be3289ff

Change-Id: I6f093b1be27f18d1d3aea0c44c031cf6c0d67d2d