[L] Change in coreboot[master]: RFC: util/sconfig: Add include keyword

[Raul Rangel (Code Review)]

Attention is currently required from: Martin L Roth, Jon Murphy, Arthur Heymans, Angel Pons, Tim Van Patten, Karthik Ramasubramanian, Felix Held.

Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74736 )

Change subject: RFC: util/sconfig: Add include keyword
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Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/74736/comment/b997c446_c8046a3b 
PS1, Line 9: Include
> > Honestly though we already define a "mainboard" chip,  […]

The mainboard device tree is passed in via `-m`, so we could either:
`stat(dirname(m) + "/chip.h")`, or update the mainboard_chip.name with the name derived from `m`. I think the former is easier IMO.