misc: pci: 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

pci/src/configuration.rs

@@ -7,6 +7,7 @@
 use std::sync::{Arc, Mutex};
 
 use byteorder::{ByteOrder, LittleEndian};
+use log::{info, warn};
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
 use vm_device::PciBarType;