That avoids having to know what type of proxy to create. Change-Id: I311e770ab720061b52f29df0dcc2273e028aa34a Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18578 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Brandon Potter <Brandon.Potter@amd.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>