Add a DMAR table to advertise IOMMU and IRQ remapping capabilities to the OS. Tested with kontron/ktqm77. Under Linux, the table is detected and interrupt remapping is enabled automatically. Change-Id: Id6ee601a0a8543ed09c6bb8d308a3a3549fc34e5 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: http://review.coreboot.org/12195 Tested-by: build bot (Jenkins) Reviewed-by: Duncan Laurie <dlaurie@google.com> Reviewed-by: Patrick Georgi <pgeorgi@google.com>