tpm: Add socket module

Add SocketDev struct. Methods in SocketDev will be used to read & write
to Ctrl channel created by swtpm.

Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>
Co-authored-by: Sean Yoo <t-seanyoo@microsoft.com>

tpm/src/lib.rs

@@ -3,6 +3,11 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+#[macro_use]
+extern crate log;
+
+pub mod socket;
+
 use anyhow::anyhow;
 use byteorder::{BigEndian, ReadBytesExt};
 use std::convert::TryInto;