Broken AMD OpenCL locality on systems with multiple PCI domains

[bgoglin]

The OpenCL extension for querying locality of AMD GPU (CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD) doesn't report the PCI domain. Systems with multiple PCI domains were rare, but at least systems with multiple MI300A CPU+GPUs (like Adastra and maybe El Capitan) use one domain per CPU now.

The issue is confirmed at ROCm/clr#106 but it won't be fixed upstream, likely because the OpenCL runtime doesn't matter anymore.

Possible solutions:

• remove AMD OpenCL locality queries since it doesn't matter much anymore apparently
• if there are multiple PCI domains in the machine, ignore AMD OpenCL locality (just attach to root)
• if there are multiple AMD GPUs with same PCI BDFs except the PCI domain, attach all of them to root