mem-ruby: MESI_Three_Level discriminate L0 invalidation reason

mem-ruby: MESI_Three_Level discriminate L0 invalidation reason

The L0 cache can now know whether a line is being invalidated
due to this cache/core's own requirements, e.g. a load from the core
causing a line eviction, or due to another cache/core's requirements,
e.g. a remote cache requesting a present line in exclusive state.

Change-Id: If57bfb92b6c8f575ca47d984606be7c859dcff9a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24259
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>