Add structs and methods for revision 3. Change-Id: Ida75f530551ad2b8b20ce7fdeffb3befc51296bc Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39806 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr> Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>