cpu: Style fixes in the AtomicSimpleCPU.

Change-Id: I42391e5a75c55022077f1ef78df97c54fa70f198
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/36976
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed