Changes for the Rust 1.59.0 update

bug: 215232614
Test: TreeHugger and compiling with m rust
Change-Id: I1d25f5550f60ff1046a3a312f7bd210483bf9364
diff --git a/keystore2/src/km_compat/lib.rs b/keystore2/src/km_compat/lib.rs
index 8abf2ba..13f7760 100644
--- a/keystore2/src/km_compat/lib.rs
+++ b/keystore2/src/km_compat/lib.rs
@@ -286,7 +286,7 @@
         let operation = begin_result.operation.unwrap();
 
         let update_aad_result = operation.updateAad(
-            &b"foobar".to_vec(),
+            b"foobar".as_ref(),
             None, /* authToken */
             None, /* timestampToken */
         );
@@ -310,7 +310,7 @@
         let operation = begin_result.operation.unwrap();
 
         let update_aad_result = operation.updateAad(
-            &b"foobar".to_vec(),
+            b"foobar".as_ref(),
             None, /* authToken */
             None, /* timestampToken */
         );