x86/PCI: put busn resource in pci_root_info for native host bridge drivers

Add the host bridge bus number aperture to the resource list.
Like the MMIO and I/O port apertures, this will be used when assigning
resources to hot-added devices or in the case of conflicts.

[bhelgaas: changelog, tidy printk]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/arch/x86/pci/bus_numa.h b/arch/x86/pci/bus_numa.h
index 226a466..ff8f65b 100644
--- a/arch/x86/pci/bus_numa.h
+++ b/arch/x86/pci/bus_numa.h
@@ -13,8 +13,7 @@
 	struct list_head list;
 	char name[12];
 	struct list_head resources;
-	int bus_min;
-	int bus_max;
+	struct resource busn;
 	int node;
 	int link;
 };