intel-agp: add chipset flushing support

This adds support for flushing the chipsets on the 915, 945, 965 and G33
families of Intel chips.

The BIOS doesn't seem to always allocate the BAR on the 965 chipsets
so I have to use pci resource code to create a resource

It adds an export for pcibios_align_resource.

arch/x86/pci/i386.c

@@ -72,7 +72,7 @@ pcibios_align_resource(void *data, struct resource *res,
 		}
 	}
 }
-
+EXPORT_SYMBOL(pcibios_align_resource);
 
 /*
  *  Handle resources of PCI devices.  If the world were perfect, we could