x86/PCI: Use pcibios_scan_root() instead of pci_scan_bus_with_sysdata()

pci_scan_bus_with_sysdata() and pcibios_scan_root() are quite similar:

  pci_scan_bus_with_sysdata
    pci_scan_bus_on_node(..., &pci_root_ops, -1)

  pcibios_scan_root
    pci_scan_bus_on_node(..., &pci_root_ops, get_mp_bus_to_node(busnum))

get_mp_bus_to_node() returns -1 if it couldn't find the node number, so
this removes pci_scan_bus_with_sysdata() and uses pcibios_scan_root()
instead.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/x86/pci/fixup.c

@@ -25,9 +25,9 @@ static void pci_fixup_i450nx(struct pci_dev *d)
 		dev_dbg(&d->dev, "i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno,
 			suba, subb);
 		if (busno)
-			pci_scan_bus_with_sysdata(busno);	/* Bus A */
+			pcibios_scan_root(busno);	/* Bus A */
 		if (suba < subb)
-			pci_scan_bus_with_sysdata(suba+1);	/* Bus B */
+			pcibios_scan_root(suba+1);	/* Bus B */
 	}
 	pcibios_last_bus = -1;
 }
@@ -42,7 +42,7 @@ static void pci_fixup_i450gx(struct pci_dev *d)
 	u8 busno;
 	pci_read_config_byte(d, 0x4a, &busno);
 	dev_info(&d->dev, "i440KX/GX host bridge; secondary bus %02x\n", busno);
-	pci_scan_bus_with_sysdata(busno);
+	pcibios_scan_root(busno);
 	pcibios_last_bus = -1;
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);