drm/amdgpu: Use pcie domain of xcc acpi objects

PCI domain/segment information of xccs is available through ACPI DSM
methods. Consider that also while looking for devices.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>