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

Change-Id: If879ae7d694caa588554628a4fff3558009aa694