systemc: align the style in sc_ext

Change-Id: I0a45ad9d9e3a2603878ee9bcdc1d416bb241deeb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59650
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
4 files changed