config: Add a 'kvm' CPU alias
config: Add a 'kvm' CPU alias

Add a CPU alias, 'kvm', for the first available KVM-accelerated CPU
model.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin