[DO NOT MERGE] Update platform security string to 2017-10-01 in nyc-dev Bug:64896113
(cherry picked from commit 73ab80dec9df8966bf660725dc1a942d9c1f324e)

Change-Id: I520b939d704143a985482509d855aadd981cdbec
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index befd346..04c2c3a 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 := 2017-09-05
+    PLATFORM_SECURITY_PATCH := 2017-10-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"