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.comReported-by: NJohn Strader <strader.john@code.jackst.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>