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/block.rs

@@ -26,6 +26,7 @@ use rate_limiter::group::{RateLimiterGroup, RateLimiterGroupHandle};
 use rate_limiter::TokenType;
 use seccompiler::SeccompAction;
 use std::collections::BTreeMap;
+use std::collections::HashMap;
 use std::collections::VecDeque;
 use std::io;
 use std::num::Wrapping;
@@ -35,7 +36,6 @@ use std::path::PathBuf;
 use std::result;
 use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::sync::{Arc, Barrier};
-use std::{collections::HashMap, convert::TryInto};
 use thiserror::Error;
 use versionize::{VersionMap, Versionize, VersionizeResult};
 use versionize_derive::Versionize;