tpm: Add recv timeout while running recvmsg

If swtpm becomes unresponsive, guest gets blocked at "recvmsg" on tpm's
data FD. This change adds a timeout to the data fd socket. If swtpm
becomes unresponsive guest waits for "timeout" (secs) and continues to
run after returning an I/O error to tpm commands.

Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>

Cargo.lock

@@ -1292,6 +1292,7 @@ dependencies = [
  "byteorder",
  "libc",
  "log",
+ "net_gen",
  "thiserror",
  "vmm-sys-util",
 ]