keystore: log receipt of auth tokens

Various recent bugs would have been easier to investigate if the auth
tokens received by keystore were logged.

Test: adb logcat while lock/unlock
Bug: 285328437
Bug: 284802403
Change-Id: Ia955d344a2bb47820c0616cc1b9784f5fcbecb0a
diff --git a/keystore2/src/authorization.rs b/keystore2/src/authorization.rs
index 4f2c7bd..de7f19a 100644
--- a/keystore2/src/authorization.rs
+++ b/keystore2/src/authorization.rs
@@ -128,6 +128,15 @@
         // Check keystore permission.
         check_keystore_permission(KeystorePerm::AddAuth).context(ks_err!())?;
 
+        log::info!(
+            "add_auth_token(challenge={}, userId={}, authId={}, authType={:#x}, timestamp={}ms)",
+            auth_token.challenge,
+            auth_token.userId,
+            auth_token.authenticatorId,
+            auth_token.authenticatorType.0,
+            auth_token.timestamp.milliSeconds,
+        );
+
         ENFORCEMENTS.add_auth_token(auth_token.clone());
         Ok(())
     }