cargo: Clean up serde dependencies

There is no need to include serde_derive separately,
as it can be specified as serde feature instead.

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

vm-device/Cargo.toml

@@ -13,8 +13,7 @@ mshv = ["vfio-ioctls/mshv"]
 anyhow = "1.0.57"
 hypervisor = { path = "../hypervisor" }
 thiserror = "1.0.31"
-serde = { version = "1.0.137", features = ["rc"] }
-serde_derive = "1.0.137"
+serde = { version = "1.0.137", features = ["rc", "derive"] }
 serde_json = "1.0.81"
 vfio-ioctls = { git = "https://github.com/rust-vmm/vfio", branch = "main", default-features = false }
 vm-memory = { version = "0.8.0", features = ["backend-mmap"] }

vm-device/src/lib.rs

@@ -3,8 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-#[macro_use]
-extern crate serde_derive;
+use serde::{Deserialize, Serialize};
 
 mod bus;
 pub mod dma_mapping;