PCI: designware: Drop pci_fixup_irqs()

Since, through struct pci_host_bridge.map/swizzle_irq hooks, IRQs are now
allocated in the pci_assign_irq() callback automatically, PCI host bridge
drivers can stop relying on pci_fixup_irqs() for IRQ allocation.

Drop pci_fixup_irqs() usage from PCI designware host bridge driver.

Signed-off-by: Lorenzo Pieralisi <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Cc: Jingoo Han <[e-mail]>
Cc: Joao Pinto <[e-mail]>

drivers/pci/dwc/pcie-designware-host.c

···
 	bridge->sysdata = pp;
 	bridge->busnr = pp->root_bus_nr;
 	bridge->ops = &dw_pcie_ops;
+	bridge->map_irq = of_irq_parse_and_map_pci;
+	bridge->swizzle_irq = pci_common_swizzle;
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
 		bridge->msi = &dw_pcie_msi_chip;
 		dw_pcie_msi_chip.dev = dev;
···
 
 	if (pp->ops->scan_bus)
 		pp->ops->scan_bus(pp);
-
-#ifdef CONFIG_ARM
-	/* support old dtbs that incorrectly describe IRQs */
-	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
-#endif
 
 	pci_bus_size_bridges(bus);
 	pci_bus_assign_resources(bus);