hypervisor, arch: Fix warnings introduced in hypervisor crate

This commit fixes some warnings introduced in the previous
hyperviosr crate PR.Removed some unused variables from arch/aarch64
module.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

arch/src/aarch64/gic.rs

@@ -1,7 +1,7 @@
 // Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-use kvm_ioctls::{DeviceFd, VmFd};
+use kvm_ioctls::DeviceFd;
 use std::sync::Arc;
 use std::{boxed::Box, result};
 

arch/src/aarch64/mod.rs

@@ -16,7 +16,6 @@ pub mod regs;
 pub use self::fdt::DeviceInfoForFDT;
 use crate::DeviceType;
 use crate::RegionType;
-use kvm_ioctls::*;
 use std::collections::HashMap;
 use std::ffi::CStr;
 use std::fmt::Debug;

arch/src/aarch64/regs.rs

@@ -13,7 +13,6 @@ use kvm_bindings::{
     KVM_REG_ARM64_SYSREG_OP1_SHIFT, KVM_REG_ARM64_SYSREG_OP2_MASK, KVM_REG_ARM64_SYSREG_OP2_SHIFT,
     KVM_REG_ARM_CORE, KVM_REG_SIZE_U64,
 };
-use kvm_ioctls::VcpuFd;
 use std::sync::Arc;
 use std::{mem, result};
 use vm_memory::GuestMemoryMmap;