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>

vm-device/src/bus.rs

@@ -7,7 +7,7 @@
 
 //! Handles routing to devices in an address space.
 
-use std::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
+use std::cmp::Ordering;
 use std::collections::btree_map::BTreeMap;
 use std::sync::{Arc, Barrier, Mutex, RwLock, Weak};
 use std::{convert, error, fmt, io, result};