DO NOT MERGE: Set display version for T

Bug: 221950960
Test: manual
Change-Id: I76ef1fa3d48b8ab5343a093ff095f7a42732df9a
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 3f857aa..ebf4328 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -58,7 +58,7 @@
 # This is the user-visible version.  In a final release build it should
 # be empty to use PLATFORM_VERSION as the user-visible version.  For
 # a preview release it can be set to a user-friendly value like `12 Preview 1`
-PLATFORM_DISPLAY_VERSION :=
+PLATFORM_DISPLAY_VERSION := 13
 
 ifndef PLATFORM_SDK_VERSION
   # This is the canonical definition of the SDK version, which defines