Patch merged into coreboot/master: nb/intel/sandybridge: Enable basic IOMMU support

the following patch was just integrated into master:
commit bb9469c450a12b876fca3a8c5e02af97c0ef36a1
Author: Nico Huber 
Date:   Wed Oct 21 11:49:23 2015 +0200

nb/intel/sandybridge: Enable basic IOMMU support

Sandy Bridge and Ivy Bridge processors have two IOMMU units. One for the
    integrated graphics controller and one for all other PCI devices. Assign
    resources for both IOMMUs and apply some quirks.

Tested with kontron/ktqm77 and a Muen based system that makes use of the
    IOMMUs. Not tested on Sandy Bridge, but register dumps show the same
    settings that are applied here.

Change-Id: I43b5e20b750e7529f448acac35de173185678fd9
    Signed-off-by: Nico Huber 
    Reviewed-on: http://review.coreboot.org/12194
    Tested-by: build bot (Jenkins)
    Reviewed-by: Duncan Laurie 
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/12194 for details.

-gerrit