Update Security String to 2016-09-06 to platform and CTS for September Security (+Quadrooter,-PZ) am: fa721839b2 am: fdf4c8d8a6 am: 21b4d9e01c am: 1f85078b1e
am: 782967785e

Change-Id: Ic5565af400aa3d3c245d5ab25d65a6244a46907d