Updating security string to 2017-07-01 on mnc
(cherry picked from commit dce5c7b9dcf30d3d8582e704733b6d702be4e64b)

Change-Id: I749d5f09a1571f47a23dd067b48ba6385c56f86c
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index a2bb05b..33b21c1 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 := 2017-06-01
+  PLATFORM_SECURITY_PATCH := 2017-07-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"