Update Security String to 2016-09-07 to platform and CTS for September respin am: a53b868e6e am: e158db8ad2 am: 68870731a5 am: f7de14b8a1 am: 2d033a9e51 am: 76582b95d1
am: 402c6f5eeb

Change-Id: I2504ce465e62ddaedb9cf6291f5b0030b19f247b