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

Change-Id: I114a7c8b86cdddbe1333ceb8ac7668c3ae0b8d10