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/thread_helper.rs

@@ -6,6 +6,7 @@
 use std::panic::AssertUnwindSafe;
 use std::thread::{self, JoinHandle};
 
+use log::error;
 use seccompiler::{SeccompAction, apply_filter};
 use vmm_sys_util::eventfd::EventFd;