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 am: 7171325d0b
am: bd18f04bd3

Change-Id: I7fd8b9d434b8ed66dafd5f94a36da089c8131cbe