Update Security String to 2019-04-01 Bug: 124119313 am: f9835d9f4d
am: a864f90501

Change-Id: I79b30b840ff5da2379422014a610fab18e896794
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 965ba12..d47cd81 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -259,7 +259,7 @@
     #  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 := 2019-03-05
+      PLATFORM_SECURITY_PATCH := 2019-04-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH