misc: Remove redundant "use" imports

With the nightly toolchain (2024-02-18) cargo check will flag up
redundant imports either because they are pulled in by the prelude on
earlier match.

Remove those redundant imports.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>

pci/src/device.rs

@@ -7,7 +7,7 @@ use crate::PciBarConfiguration;
 use std::any::Any;
 use std::fmt::{self, Display};
 use std::sync::{Arc, Barrier, Mutex};
-use std::{self, io, result};
+use std::{io, result};
 use vm_allocator::{AddressAllocator, SystemAllocator};
 use vm_device::{BusDevice, Resource};