PCI: add Ralink RT2800 broken INTx masking quirk

Passes pci_intx_mask_supported test but continues to send interrupts
as discovered through VFIO-based device assignment.

http://www.spinics.net/lists/kvm/msg73738.html

[bhelgaas: use HEADER, not FINAL, which is currently broken for hotplug]
Tested-by: Andreas Hartmann <andihartmann@01019freenet.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/quirks.c

@@ -2940,6 +2940,8 @@ static void __devinit quirk_broken_intx_masking(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CHELSIO, 0x0030,
 			 quirk_broken_intx_masking);
+DECLARE_PCI_FIXUP_HEADER(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */
+			 quirk_broken_intx_masking);
 
 static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
 			  struct pci_fixup *end)