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 am: f1ee7d660f am: d3d24134a6 am: f94bec3382 am: d1dae843e3
am: e74b93886f

Change-Id: Ieb87642396eaa90daa76f09fd19d5746299f8f44