Commit 9eecabcb ("intel-iommu: Abort 
IOMMU setup for igfx if BIOS gave no shadow GTT space") uses a bunch of 
magic numbers. Provide #defines for those to make it look slightly saner.
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>