Update Security String to 2020-06-01
Bug: 153882927

Change-Id: Ibae64bd6c82ddb1afc801550fd7c4ac7bceeb4cc
(cherry picked from commit 388e6839348f6b4b66e099ab00d0d2f08304e761)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index c823077..af9ab6b 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 := 2020-05-05
+      PLATFORM_SECURITY_PATCH := 2020-06-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH