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/lib.rs

@@ -3,9 +3,6 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-#[macro_use]
-extern crate log;
-
 pub mod emulator;
 pub mod socket;