virtinst: prefer cores when exposing topology to the guest

In real world silicon though it is rare to have high socket/die counts,
but common to have huge core counts.

Some OS will even refuse to use sockets over a certain count.

Thus we prefer to expose cores to the guest rather than sockets as the
default for missing fields.

This matches a recent change made in QEMU for new machine types

  commit 4a0af2930a4e4f64ce551152fdb4b9e7be106408
  Author: Yanan Wang <wangyanan55@huawei.com>
  Date:   Wed Sep 29 10:58:09 2021 +0800

    machine: Prefer cores over sockets in smp parsing since 6.2

Closes: https://github.com/virt-manager/virt-manager/issues/155
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

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