Updating security string to 2016-09-01 to platform and CTS in preparation for 2016 September OTA

b/30224278

Change-Id: I8032d58d2965fcf2c412a098cfa1d1e4c0add01d
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index c88c0c9..a4cd769 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -103,7 +103,7 @@
   # Can be an arbitrary string, but must be a single word.
   #
   # If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-  PLATFORM_SECURITY_PATCH := 2016-08-05
+  PLATFORM_SECURITY_PATCH := 2016-09-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"