Update Security String to 2021-02-01 am: ad7b650e2d am: ffc4671fce

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/13219376

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I258d82e7d0a16c94689806168a7a6b02fcbb7897
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 251f2a8..9b061f3 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 := 2021-01-01
+      PLATFORM_SECURITY_PATCH := 2021-02-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH