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>

virtio-devices/src/vhost_user/vu_common_ctrl.rs

@@ -15,7 +15,6 @@ use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::thread::sleep;
 use std::time::{Duration, Instant};
-use std::vec::Vec;
 use vhost::vhost_kern::vhost_binding::{VHOST_F_LOG_ALL, VHOST_VRING_F_LOG};
 use vhost::vhost_user::message::{
     VhostUserHeaderFlag, VhostUserInflight, VhostUserProtocolFeatures, VhostUserVirtioFeatures,