Updating security string to 2016-09-05 in preparation for 2016 September OTA for b/30224278 am: a234c54e2a am: 48e360c73b am: a08cbbb97c am: a96455528c am: d6eb8a739d
am: 8118421197

Change-Id: I6193353b95e616370adbfa2618d568073f167790