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>

hypervisor/src/kvm/aarch64/mod.rs

@@ -23,7 +23,7 @@ use kvm_bindings::{
 pub use kvm_bindings::{
     kvm_one_reg as Register, kvm_regs as StandardRegisters, kvm_vcpu_init as VcpuInit, RegList,
 };
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 pub use {kvm_ioctls::Cap, kvm_ioctls::Kvm};
 
 // This macro gets the offset of a structure (i.e `str`) member (i.e `field`) without having

hypervisor/src/kvm/mod.rs

@@ -21,7 +21,7 @@ use crate::vm::{self, InterruptSourceConfig, VmOps};
 #[cfg(target_arch = "aarch64")]
 use crate::{arm64_core_reg_id, offset__of};
 use kvm_ioctls::{NoDatamatch, VcpuFd, VmFd};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 #[cfg(target_arch = "aarch64")]
 use std::convert::TryInto;

hypervisor/src/kvm/x86_64/mod.rs

@@ -10,7 +10,7 @@
 
 use crate::arch::x86::{msr_index, SegmentRegisterOps, MTRR_ENABLE, MTRR_MEM_TYPE_WB};
 use crate::kvm::{Cap, Kvm, KvmError, KvmResult};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 
 ///
 /// Export generically-named wrappers of kvm-bindings for Unix-based platforms

hypervisor/src/mshv/mod.rs

@@ -15,7 +15,7 @@ use crate::vm::{self, InterruptSourceConfig, VmOps};
 pub use mshv_bindings::*;
 pub use mshv_ioctls::IoEventAddress;
 use mshv_ioctls::{set_registers_64, Mshv, NoDatamatch, VcpuFd, VmFd};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::sync::{Arc, RwLock};
 use vm::DataMatch;

hypervisor/src/mshv/x86_64/mod.rs

@@ -8,7 +8,7 @@
 //
 //
 use crate::arch::x86::{msr_index, SegmentRegisterOps, MTRR_ENABLE, MTRR_MEM_TYPE_WB};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use std::fmt;
 
 ///