Update Security String to 2020-05-01

Bug: 151752725
Change-Id: Ief4b514032bfad1fad1a81c68b4f5e360569f105
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 4f8713f..5dd68b6 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -250,7 +250,7 @@
     #  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 := 2020-04-05
+      PLATFORM_SECURITY_PATCH := 2020-05-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH