misc: virtio-devices: drop extern crate, use modern rust

This commit is part of a series of similar commits.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

virtio-devices/src/rng.rs

@@ -11,6 +11,8 @@ use std::sync::{Arc, Barrier};
 use std::{io, result};
 
 use anyhow::anyhow;
+use event_monitor::event;
+use log::{error, info};
 use seccompiler::SeccompAction;
 use serde::{Deserialize, Serialize};
 use thiserror::Error;