[coreboot-gerrit] Change in coreboot[master]: abuild: Fix board variant handling

[Keith Hui (Code Review)]

Keith Hui has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/41918 )

Change subject: abuild: Fix board variant handling
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Patch Set 1:

If we don't want to land this patch, we will have to put out a full "Documentation" [1] on abuild that we have to use this format:

eg. to build test asus/p5qpl-am/variants/p5g41t-m_lx/, one has to run:
$ util/abuild/abuild -t asus/p5qpl-am -b p5g41t_m_lx

Meanwhile substitution underscores for dashes for base target like p5qpl_am does not work.

[1] Yes, I mean add full documentation under Documentation/