Update Platform Security String to 2019-03-05 for pi-dev Bug:122541777
(cherry picked from commit ac6eac206d0e4b0604a362d1bcbfae3e1b03bfc2)

Change-Id: I2a39815b3589870e8d0cff64d6447a9fc1946d19
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index b64dd1b..d386a52 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 := 2019-03-01
+      PLATFORM_SECURITY_PATCH := 2019-03-05
 endif
 
 ifndef PLATFORM_SECURITY_PATCH_TIMESTAMP