PCI: cadence: Remove pci_epf_linkup() from Cadence EP driver

pci_epf_linkup() is intended to be invoked if the EPC supports linkup
notification. Now that pci-epf-test uses the get_features() callback,
which indicates Cadence EP driver doesn't support the linkup notification,
remove pci_epf_linkup() from Cadence EP driver.
Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/pcie-cadence-ep.c

@@ -396,18 +396,6 @@ static int cdns_pcie_ep_start(struct pci_epc *epc)
 		cfg |= BIT(epf->func_no);
 	cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, cfg);
 
-	/*
-	 * The PCIe links are automatically established by the controller
-	 * once for all at powerup: the software can neither start nor stop
-	 * those links later at runtime.
-	 *
-	 * Then we only have to notify the EP core that our links are already
-	 * established. However we don't call directly pci_epc_linkup() because
-	 * we've already locked the epc->lock.
-	 */
-	list_for_each_entry(epf, &epc->pci_epf, list)
-		pci_epf_linkup(epf);
-
 	return 0;
 }