PCI: Introduce pci_pcie_type(dev) to replace pci_dev->pcie_type

Introduce an inline function pci_pcie_type(dev) to extract PCIe
device type from pci_dev->pcie_flags_reg field, and prepare for
removing pci_dev->pcie_type.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index 58ad791..f7c6245 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -81,10 +81,11 @@
 static int set_device_error_reporting(struct pci_dev *dev, void *data)
 {
 	bool enable = *((bool *)data);
+	int type = pci_pcie_type(dev);
 
-	if ((dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) ||
-	    (dev->pcie_type == PCI_EXP_TYPE_UPSTREAM) ||
-	    (dev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)) {
+	if ((type == PCI_EXP_TYPE_ROOT_PORT) ||
+	    (type == PCI_EXP_TYPE_UPSTREAM) ||
+	    (type == PCI_EXP_TYPE_DOWNSTREAM)) {
 		if (enable)
 			pci_enable_pcie_error_reporting(dev);
 		else