PCI: dra7xx: Use dw_pcie_link_up() consistently

We already use dw_pcie_link_up() once in dra7xx_pcie_establish_link(), but
we duplicate its code later.  Use dw_pcie_link_up() for consistency.  No
functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>

drivers/pci/host/pci-dra7xx.c

@@ -107,8 +107,7 @@ static int dra7xx_pcie_establish_link(struct pcie_port *pp)
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
 
 	while (retries--) {
-		reg = dra7xx_pcie_readl(dra7xx,	PCIECTRL_DRA7XX_CONF_PHY_CS);
-		if (reg & LINK_UP)
+		if (dw_pcie_link_up(pp))
 			break;
 		usleep_range(10, 20);
 	}