powerpc/eeh: Use pci_dev_id() to simplify the code

PCI core API pci_dev_id() can be used to get the BDF number for a pci
device. We don't need to compose it mannually. Use pci_dev_id() to
simplify the code a little bit.
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230815023303.3515503-1-zhangjialin11@huawei.com

arch/powerpc/platforms/powernv/eeh-powernv.c

@@ -855,8 +855,7 @@ static int pnv_eeh_bridge_reset(struct pci_dev *pdev, int option)
 	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 	struct pnv_phb *phb = hose->private_data;
 	struct device_node *dn = pci_device_to_OF_node(pdev);
-	uint64_t id = PCI_SLOT_ID(phb->opal_id,
-				  (pdev->bus->number << 8) | pdev->devfn);
+	uint64_t id = PCI_SLOT_ID(phb->opal_id, pci_dev_id(pdev));
 	uint8_t scope;
 	int64_t rc;