bindings: Remove duplicate with-serde cfg() macro

Signed-off-by: Nuno Das Neves <nudasnev@microsoft.com>

Author: NunoDasNeves

mshv-bindings/src/x86_64/serializers.rs

@@ -2,7 +2,6 @@
 //
 // SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
 //
-#![cfg(feature = "with-serde")]
 
 use serde::de::{Deserialize, Deserializer};
 use serde::{Serialize, Serializer};