systemc: Provide a utility Port TLM socket wrapper class.
systemc: Provide a utility Port TLM socket wrapper class.

This class should make it easy to attach TLM sockets into the gem5
python Port config mechanism.

Change-Id: I3548c654d56bfc852f3fc98fe6433163b14f7fe3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17230
Reviewed-by: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>
Maintainer: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5