systemc: Implement sc_mutex.

Change-Id: I8a5bd03b46d44aeca3bba15a01a5f2180b4ed5c7
Reviewed-on: https://gem5-review.googlesource.com/c/12618
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
2 files changed