Update Security String to 2020-11-01 am: efacba8eef

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12617844

Change-Id: I4fca4c04dedc5cd8e9bb6f2b7bed3b5e2797563e
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 5ccaa98..62c7472 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -186,7 +186,7 @@
     #  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 := 2020-10-01
+      PLATFORM_SECURITY_PATCH := 2020-11-01
 endif
 
 ifndef PLATFORM_BASE_OS