PCI: layerscape: Add class code and multifunction fixups for ls1021a

The current code depends on class code and multifunction fixups done by the
bootloader.  Perform these fixups in ls1021_pcie_host_init() to remove this
dependency.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Roy Zang <tie-fei.zang@freescale.com>

drivers/pci/dwc/pci-layerscape.c

@@ -134,6 +134,11 @@ static int ls1021_pcie_host_init(struct pcie_port *pp)
 
 	dw_pcie_setup_rc(pp);
 
+	iowrite32(1, pci->dbi_base + PCIE_DBI_RO_WR_EN);
+	ls_pcie_fix_class(pcie);
+	ls_pcie_clear_multifunction(pcie);
+	iowrite32(0, pci->dbi_base + PCIE_DBI_RO_WR_EN);
+
 	ls_pcie_drop_msg_tlp(pcie);
 
 	return 0;