PCI: Mark Ceton InfiniTV4 INTx masking as broken

PCI_COMMAND_INTX_DISABLE is writable on the Ceton InfiniTV4, indicating
that the device supports disabling the INTx# signal, but it apparently
doesn't work.

Mark the device so we know we can't use PCI_COMMAND_INTX_DISABLE to disable
its interrupts.

Link: https://lkml.kernel.org/r/92a65068-60b2-c1a8-9e17-ac41fe3c5c93@code.jackst.com
Reported-by: John Strader <strader.john@code.jackst.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/quirks.c

@@ -3215,6 +3215,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, 0x0030,
 			quirk_broken_intx_masking);
 DECLARE_PCI_FIXUP_FINAL(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */
 			quirk_broken_intx_masking);
+DECLARE_PCI_FIXUP_FINAL(0x1b7c, 0x0004, /* Ceton InfiniTV4 */
+			quirk_broken_intx_masking);
 
 /*
  * Realtek RTL8169 PCI Gigabit Ethernet Controller (rev 10)