[coreboot] cbfstool without cloning the whole repos? Use this script for <4MB download

[Mike Banon]

The original script has been created by my friend Ivan Ivanov aka
qmastery [1] but I noticed that it doesn't work anymore - because a
cbfstool got a lot more new dependencies: 4MB of sources, compared to
the previous 2MB. Had to update this script heavily [2] and now it's
working fine as of today.

[1] https://mail.coreboot.org/hyperkitty/list/[e-mail]/thread/VQHRAEF...
[2] https://review.coreboot.org/c/coreboot/+/51393