misc: tpm: 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

tpm/src/socket.rs

@@ -8,6 +8,7 @@ use std::os::unix::io::{AsRawFd, RawFd};
 use std::os::unix::net::UnixStream;
 
 use anyhow::anyhow;
+use log::debug;
 use thiserror::Error;
 use vmm_sys_util::sock_ctrl_msg::ScmSocket;