Updating security patch string to 2016-03-01

b/26499556

Change-Id: I18a5ad9d8d08e2050053bcebc1a9a0c46db86733
(cherry picked from commit c24c6ccd4d5de8be010b74b9021b8fdb926e1dad)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index bf9b2e8..be5833d 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -103,7 +103,7 @@
   # Can be an arbitrary string, but must be a single word.
   #
   # If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-  PLATFORM_SECURITY_PATCH := 2016-02-01
+  PLATFORM_SECURITY_PATCH := 2016-03-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"