KVM: selftests: Use KVM_IOCTL_ERROR() for one-off arm64 ioctls

Use the KVM_IOCTL_ERROR() macro to generate error messages for a handful
of one-off arm64 ioctls.  The calls in question are made without an
associated struct kvm_vm/kvm_vcpu as they are used to configure those
structs, i.e. can't be easily converted to e.g. vcpu_ioctl().

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