clean up the coreboot submodules

also bring the coreboot/next modules in line with
the recent merge that did away with coreboot/dell7

the submodules for coreboot/haswell were still there,
and have now been deleted; the haswell tree was used
for the NRI patches, which were moved to /default some
time ago

Signed-off-by: Leah Rowe <leah@libreboot.org>

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