Keystore 2.0: Fix version binding for user generated attestation keys.

User generated attestation keys need to be upgraded on firmware version
bump.

This also fixes keystore 2 panicking when user generated attestation
keys are used.

Bug: 183220507
Test: Oh well.
Change-Id: Ib0adcc3bdd20d8e46ef4283f8834b74485d5d37a
diff --git a/keystore2/src/lib.rs b/keystore2/src/lib.rs
index 0e51eff..bdb599d 100644
--- a/keystore2/src/lib.rs
+++ b/keystore2/src/lib.rs
@@ -35,6 +35,7 @@
 pub mod user_manager;
 pub mod utils;
 
+mod attestation_key_utils;
 mod db_utils;
 mod gc;
 mod super_key;