cpu,configs: let RISC-V use the PT walker cache.

Change-Id: I19b1dd9e3c55c433c897988d36e6715017273c66
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26988
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
3 files changed