Set SPL to 2020-01-01

bug:144373594
(cherry picked from commit 07e7d6b643c533644f8d6d021118cf00fe67d17a)

Change-Id: If202db392c0cd1033d5c52138570f45cf5de107c
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 892a07d..b932b0d 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 := 2019-12-05
+      PLATFORM_SECURITY_PATCH := 2020-01-01
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH