PCI: imx6: Drop old IRQ mapping

We don't need this anymore.  The IRQs are now properly mapped through the
DT.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Richard Zhu <r65037@freescale.com>

drivers/pci/host/pci-imx6.c

@@ -483,12 +483,6 @@ static int __init imx6_add_pcie_port(struct pcie_port *pp,
 {
 	int ret;
 
-	pp->irq = platform_get_irq(pdev, 0);
-	if (!pp->irq) {
-		dev_err(&pdev->dev, "failed to get irq\n");
-		return -ENODEV;
-	}
-
 	pp->root_bus_nr = -1;
 	pp->ops = &imx6_pcie_host_ops;