device/pci: Replace use of dev_find_slot() for IRQs

Change-Id: I48c0de73338430282ce1a4442bbeb7c867dc174c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34079
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/emulation/qemu-i440fx/mainboard.c

@@ -41,7 +41,7 @@ static void qemu_nb_init(struct device *dev)
 
 	/* setup IRQ routing */
 	for (i = 0; i < 32; i++)
-		pci_assign_irqs(0, i, qemu_i440fx_irqs + (i % 4));
+		pci_assign_irqs(pcidev_on_root(i, 0), qemu_i440fx_irqs + (i % 4));
 }
 
 static struct device_operations nb_operations = {