Updating Platform Security String to 2018-09-05
Bug: 111501777
(cherry picked from commit 6bc223c9af044ad06e2f1abc0c4570a7371f9a3a)

Change-Id: I3f30c36dba63b6f4bd738a3f310edc10c9bf784a
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index af45d44..3c1c3c9 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -231,7 +231,7 @@
     #  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 := 2018-08-05
+      PLATFORM_SECURITY_PATCH := 2018-09-05
 endif
 
 ifndef PLATFORM_SECURITY_PATCH_TIMESTAMP