[DO NOT MERGE] Updating Security String to 2017-09-01 Bug:63846344
(cherry picked from commit 8d56fc91b1a899d5dc9d34ff8dd3b081a5bb4560)

Change-Id: Ie55721e654e717310181c06660b424204a876318
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index bb95a84..98b74ba 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -114,7 +114,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-    PLATFORM_SECURITY_PATCH := 2017-08-05
+    PLATFORM_SECURITY_PATCH := 2017-09-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"