PCI: alpha: use generic INTx swizzle from PCI core

Use the generic pci_common_swizzle() instead of arch-specific code.

Note that pci_common_swizzle() loops based on dev->bus->self, not
dev->bus->parent as the alpha common_swizzle() did.  I think they
are equivalent for this purpose.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/arch/alpha/kernel/pci_impl.h b/arch/alpha/kernel/pci_impl.h
index 7336651..00edd04 100644
--- a/arch/alpha/kernel/pci_impl.h
+++ b/arch/alpha/kernel/pci_impl.h
@@ -107,7 +107,7 @@
  *   Thus, each swizzle is ((pin-1) + (device#-4)) % 4
  *
  *   pci_swizzle_interrupt_pin() swizzles for exactly one bridge.  The routine
- *   common_swizzle below handles multiple bridges.  But there are a
+ *   pci_common_swizzle() handles multiple bridges.  But there are a
  *   couple boards that do strange things.
  */
 
@@ -179,7 +179,7 @@
 extern unsigned long alpha_agpgart_size;
 
 extern void common_init_pci(void);
-extern u8 common_swizzle(struct pci_dev *, u8 *);
+#define common_swizzle pci_common_swizzle
 extern struct pci_controller *alloc_pci_controller(void);
 extern struct resource *alloc_resource(void);