Update security string to 2016-09-07 to platform and CTS for September   respin am: cc5148493f am: 637fa9c4c5 am: 5ed4043667 am: 48e00645fe am: f63dfac0e3
am: a14e8c2f31

Change-Id: I471611e0996ab801d105a392fafbb8c1008c3350