Revert "mem-ruby: bug fix for Finish_CopyBack_Stale"

This reverts commit f7cf47bc313945509020fd5b430262801e492f31.

Reason for revert: introduces an issue when handling a stale WriteBack

Change-Id: I4bd370911cb003c0c99e5fd14866b8c98afa80e2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63412
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
1 file changed