Update Security String to 2020-09-01 am: dca1803d95 am: 21181c4726

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12037363

Change-Id: I4ab39e706348fc2599fe93a339badda4e5466c95
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 5da2093..4234a9f 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -240,7 +240,7 @@
     #  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 := 2020-08-05
+      PLATFORM_SECURITY_PATCH := 2020-09-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH