fastmodel: Fix cluster build failed

FastModelCortexCluster subclasses don't have `type` property. They don't
need to be specified in sim_objects for generating *Params class.

Change-Id: Ic09e494042e05d68c890f9603b8b78a4a8d815a9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55305
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56247
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
2 files changed