[DO NOT MERGE] Update Security String to 2017-02-01 on mnc-dev am: f92880e0c7 am: 6083d8337c
am: e76d1419c7

Change-Id: I376173b292e1e26c5de1147312caa94f0a531af1
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 5d5bae6..69d3f1b 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -105,7 +105,7 @@
   #  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 := 2017-01-05
+  PLATFORM_SECURITY_PATCH := 2017-02-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"