mem-ruby: Fix Prefetcher to RubyPrefetcher in StateMachine.
mem-ruby: Fix Prefetcher to RubyPrefetcher in StateMachine.

After renaming Prefetcher to RubyPrefetcher, the slicc generator
should be updated to correctly initialize the prefetcher with
the controller.

Change-Id: Ia12a4640c35aaedd70a4a14e5a10793b060ba924
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29974
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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