Revert "Revert "Implement addAuthToken method of IKeystoreAuthorization ...""

This reverts commit 96f410658821497db0f562c2ba2bc359bc3b1dfc.

Reason for revert: This change does not have an impact on the observed behavior, It can land by itself.

Change-Id: I7e1ff63d0bae77b4382047eaaacb8d34e31e2bc4
diff --git a/keystore2/src/lib.rs b/keystore2/src/lib.rs
index f73cd59..240998e 100644
--- a/keystore2/src/lib.rs
+++ b/keystore2/src/lib.rs
@@ -17,6 +17,7 @@
 
 pub mod apc;
 pub mod auth_token_handler;
+pub mod authorization;
 pub mod background_task_handler;
 pub mod database;
 pub mod enforcements;