[DO NOT MERGE] Update security string to 2018-02-01 for oc-dev
bug:70348883

Change-Id: Ib87775083eb064c485a44dffcf3b4630d33d39c5
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index d88e26f..8937d6e 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -165,7 +165,7 @@
     #  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 := 2018-01-05
+      PLATFORM_SECURITY_PATCH := 2018-02-01
 endif
 
 ifndef PLATFORM_BASE_OS