mem-ruby: Add (BUSY_BLKD,SnpOnceFwd) transition

Add (BUSY_BLKD,SnpOnceFwd) cache transition
to the Ruby CHI protocol.

Change-Id: I150880b26dee869b48cfd16fb661b9487527a8cd
Signed-off-by: Carlos Falquez <c.falquez@fz-juelich.de>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46901
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Tiago Mück <tiago.muck@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed