config: skip access to branchPred in ARM KVM
config: skip access to branchPred in ARM KVM

Prevents runtime error:

AttributeError: object 'ArmV8KvmCPU' has no attribute 'branchPred'

Change-Id: Ic5765fd560381cbacc2fa2fd2e6f79d98433c535
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21299
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Maintainer: Jason Lowe-Power <68c46a606457643eab92053c1c05574abb26f861@lowepower.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5