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

Change-Id: Id8709a33bf19fb106341a8aed5f2978adf91a7ef