PCI: replace struct pci_bus secondary/subordinate with busn_res

Replace the struct pci_bus secondary/subordinate members with the
struct resource busn_res.  Later we'll build a resource tree of these
bus numbers.

[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index 2555250..f077108 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -461,7 +461,7 @@
 			if (!sys->bus)
 				panic("PCI: unable to scan bus!");
 
-			busnr = sys->bus->subordinate + 1;
+			busnr = sys->bus->busn_res.end + 1;
 
 			list_add(&sys->node, head);
 		} else {