Updating Security string to 2017-01-01 on mnc-dev

b/32949407

Change-Id: Ic4d1a23ede0ff6faed15747794d551769aeec9ad
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index e30ea21..65bbf74 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 := 2016-12-01
+  PLATFORM_SECURITY_PATCH := 2017-01-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"