[DO NOT MERGE] Update Security String to 2017-04-05 on lmp-dev

Bug:35314737
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index a2c60aa..94d3d89 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -75,7 +75,7 @@
   # 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 := 2017-04-01
+  PLATFORM_SECURITY_PATCH := 2017-04-05
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"