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: 143faf4aa4

Change-Id: I609aed99cf16fa87415f17a8c551e1a589cb4e8f