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/vsock/device.rs

@@ -530,7 +530,6 @@ mod tests {
     use super::super::tests::{NoopVirtioInterrupt, TestContext};
     use super::super::*;
     use super::*;
-    use crate::vsock::device::{BACKEND_EVENT, EVT_QUEUE_EVENT, RX_QUEUE_EVENT, TX_QUEUE_EVENT};
     use crate::ActivateError;
     use libc::EFD_NONBLOCK;