PCI: xgene: Remove unused platform data

The xgene driver never uses the platform drvdata pointer, so don't
bother setting it.  No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pci-xgene.c

@@ -563,8 +563,6 @@ static int xgene_pcie_probe_bridge(struct platform_device *pdev)
 	pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
 	pci_bus_add_devices(bus);
-
-	platform_set_drvdata(pdev, port);
 	return 0;
 
 error: