PCI: rockchip: Use PCI_NUM_INTX

Use the PCI_NUM_INTX macro to indicate the number of PCI INTx interrupts
rather than the magic number 4. This makes it clearer where the number
comes from & what it relates to.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Shawn Lin <shawn.lin@rock-chips.com>

drivers/pci/host/pcie-rockchip.c

@@ -1211,7 +1211,7 @@ static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
 		return -EINVAL;
 	}
 
-	rockchip->irq_domain = irq_domain_add_linear(intc, 4,
+	rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
 						    &intx_domain_ops, rockchip);
 	if (!rockchip->irq_domain) {
 		dev_err(dev, "failed to get a INTx IRQ domain\n");