Update TEST_MAPPING

Test: cd external/rust/crates && atest --host -c
Change-Id: I974a4251c25454016c79b26354afc601ced6c48d
diff --git a/TEST_MAPPING b/TEST_MAPPING
index a13141c..684ef48 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -3,6 +3,9 @@
   "imports": [
     {
       "path": "external/rust/crates/bitflags"
+    },
+    {
+      "path": "external/rust/crates/crossbeam-utils"
     }
   ]
 }