arch-x86, cpu-kvm: add x86 kvm test to long regression
arch-x86, cpu-kvm: add x86 kvm test to long regression

revised patch based on reviews

Change-Id: I18d219080ff8ab1c42c9e1a12aadd89606802b25
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34855
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: mike upton <d61f0b5f6cf73b59a52ce6c8a4f6988294d747b6@gmail.com>

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