pci: expose TYPE_XIO3130_DOWNSTREAM name

Type name will be used in followup patch for cast check
in pcihp code.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20220301151200.350729

pci: expose TYPE_XIO3130_DOWNSTREAM name

Type name will be used in followup patch for cast check
in pcihp code.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20220301151200.3507298-2-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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