[coreboot-gerrit] Change in coreboot[master]: Makefile.inc: Add CARRIER_DIR to component discovery

[Maxim Polyakov (Code Review)]

Maxim Polyakov has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/42609 )

Change subject: Makefile.inc: Add CARRIER_DIR to component discovery
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Patch Set 18:
> Patch Set 17:
> > Patch Set 10:
> > > What's the relationship between carrier boards and modules: can a carrier
> > > board be used for modules that differ more than what we could model in
> > > variants?
> >
> > In the case of the Kontron module, variant refers to the COMe-mAL10 or COMe-m4AL10
> > module type. They differ in the type of memory (DDR3L or DDR4), and maybe they
> > differ in some chips.
>
> […]
>
> Can you add part of this explanation/answer, I just left the first paragraph, to the commit message? That’d be great as documentation.

I have added more details about my idea to the commit message, please review.
Thanks