Update Security String from 08-05 to 2019-08-01
Bug:126590667

Merged-In: a3e1c57a95d895fff372054205914bc322b025a1
(cherry picked from commit 0b6993aa3aa9053f3a762e380a8fb8f68636b932)

Change-Id: I8bac1bfd93dbc1a7c25888472cd4f240094040e9
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 0e64739..ab7c222 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -231,7 +231,7 @@
     #  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 := 2019-08-05
+      PLATFORM_SECURITY_PATCH := 2019-08-01
 endif
 
 ifndef PLATFORM_SECURITY_PATCH_TIMESTAMP