cpu-o3: convert rename to new style stats

Change-Id: Id34a85e40ad7e83d5805a034df6e0c5ad9b9af82
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33397
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed