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/csm/connection.rs

@@ -672,18 +672,13 @@ where
 
 #[cfg(test)]
 mod tests {
-    use libc::EFD_NONBLOCK;
-    use virtio_queue::QueueOwnedT;
-
-    use std::io::{Error as IoError, ErrorKind, Read, Result as IoResult, Write};
-    use std::os::unix::io::RawFd;
-    use std::time::{Duration, Instant};
-    use vmm_sys_util::eventfd::EventFd;
-
-    use super::super::super::defs::uapi;
     use super::super::super::tests::TestContext;
     use super::super::defs as csm_defs;
     use super::*;
+    use libc::EFD_NONBLOCK;
+    use std::io::{Error as IoError, Result as IoResult};
+    use virtio_queue::QueueOwnedT;
+    use vmm_sys_util::eventfd::EventFd;
 
     const LOCAL_CID: u64 = 2;
     const PEER_CID: u64 = 3;

virtio-devices/src/vsock/csm/txbuf.rs

@@ -146,8 +146,8 @@ impl TxBuf {
 mod tests {
     use super::*;
     use std::io::Error as IoError;
+    use std::io::ErrorKind;
     use std::io::Result as IoResult;
-    use std::io::{ErrorKind, Write};
 
     struct TestSink {
         data: Vec<u8>,