attach_interface_with_model: don't attach incompatible controller

[smitterl]

On s390x, pcie-to-pci-bridge is not available. Don't attach this.

[smitterl]

JOB ID     : 1c3bfb6885d7d232d2c7ce957d6c404b644830e2
JOB LOG    : /var/log/avocado/job-results/job-2024-09-05T06.18-1c3bfb6/job.log
 (1/1) type_specific.io-github-autotest-libvirt.virtual_network.hotplug.attach_interface.model.virtio: PASS (37.81 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML   : /var/log/avocado/job-results/job-2024-09-05T06.18-1c3bfb6/results.html
JOB TIME   : 38.28 s

[smitterl]

@Yingshun Please help review.