[DO NOT MERGE] Update Security String to 2018-04-05 in oc-dev
Bug:73240847
(cherry picked from commit 312d7e7a3c020ed2aec01584ca80b6d6b76800de)

Change-Id: Iaefd75bd604bfdbbd91bf3c8ed15c7533b57779a
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 648a21d..ba494ff 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -181,7 +181,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  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 := 2018-04-01
+      PLATFORM_SECURITY_PATCH := 2018-04-05
 endif
 
 ifndef PLATFORM_BASE_OS