These boards get purism-blobs as a submodule of the purism coreboot
fork. modules/coreboot used to skip the purism-blobs dependency for
this fork, but the module is not needed at all for these boards.
librem_l1um keeps CONFIG_PURISM_BLOBS=y since it is built from patched
coreboot 4.11.
Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
