system: Delete alpha files from system.

Change-Id: I42b8ea34fb64b6dc7bdf3c09310011cfd989a7d9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24646
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
20 files changed