Some of our tests require KVM. Tagging these tests as such allow us to filter them in or out during testing. Change-Id: I3f188d3e268409535043cc32b64d99e4657638cd Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56829 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>