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: 831bee139d
am: 2141e6de1a

Change-Id: I03f2a54c52c4dc8dfc5113c90ffe45c5fd5fdc0a