KVM: selftests: Rename vcpu.state => vcpu.run

Rename the "state" field of 'struct vcpu' to "run".  KVM calls it "run",
the struct name is "kvm_run", etc...

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>