[M] Change in coreboot[main]: util/cbfstool: Optionally place new components as high as possible

[Shuo Liu (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Chen, Gang C, Christian Walter, Intel coreboot Reviewers, Jincheng Li, Patrick Rudolph.

Shuo Liu has posted comments on this change by Shuo Liu. ( https://review.coreboot.org/c/coreboot/+/86569?usp=email )

Change subject: util/cbfstool: Optionally place new components as high as possible
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Patch Set 4:

This change is ready for review.