Updating security string to 2016-07-01

b/28912173

Change-Id: Ib40892d3185285cf4e95abb655a96c76258e17b1
(cherry picked from commit 45ff24a04bd5d3af706ae3aa6266106560070a3d)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index e0c68cf..d646a85 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 := 2016-06-01
+  PLATFORM_SECURITY_PATCH := 2016-07-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"