Add IMOK method support for DPTF BRANCH=None BUG=b:187797417 TEST=Built and tested on dedede board Change-Id: I8edfa3bcaa6bde0b9690fcace000cd582dcc81d2 Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/54688 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>