KVM: selftests: Move evmcs.h to x86_64/

evmcs.h is x86_64 only thing, move it to x86_64/ subdirectory.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-30-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/include/evmcs.h → tools/testing/selftests/kvm/include/x86_64/evmcs.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * tools/testing/selftests/kvm/include/vmx.h
+ * tools/testing/selftests/kvm/include/x86_64/evmcs.h
  *
  * Copyright (C) 2018, Red Hat, Inc.
  *