PCI: Add ACS quirk for Solarflare SFC9120 & SFC9140

Solarflare confirms that these devices do not allow peer-to-peer between
functions.  Quirk them to allow IOMMU grouping to expose this isolation.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Robert Stonehouse <rstonehouse@solarflare.com>