Symmetric keyguard-bound superencryption

Bug: 163866361
Test: keystore2_test
Test: atest android.keystore.cts.CipherTest#testEmptyPlaintextEncryptsAndDecryptsWhenUnlockedRequired
Change-Id: I8b6136dce9ae93ffbeea04f41eaf468f82c67a91
diff --git a/keystore2/src/lib.rs b/keystore2/src/lib.rs
index b6df8e8..97b0bed 100644
--- a/keystore2/src/lib.rs
+++ b/keystore2/src/lib.rs
@@ -35,6 +35,7 @@
 pub mod security_level;
 pub mod service;
 pub mod shared_secret_negotiation;
+pub mod try_insert;
 pub mod utils;
 
 mod attestation_key_utils;