PCI: layerscape: Use dw_pcie_link_up() consistently

All the other DesignWare-based drivers use dw_pcie_link_up(), so use it in
this driver, too, for consistency.  No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>

drivers/pci/host/pci-layerscape.c

@@ -70,7 +70,7 @@ static void ls_pcie_host_init(struct pcie_port *pp)
 
 	dw_pcie_setup_rc(pp);
 
-	while (!ls_pcie_link_up(pp)) {
+	while (!dw_pcie_link_up(pp)) {
 		usleep_range(100, 1000);
 		count++;
 		if (count >= 200) {