[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/a7b93d12_9b9b94bd 
PS1, Line 9: Include
> Definitely they are viable alternatives. Couple of questions: […]

I meant do a `stat` call and see if the chip.h exists in the mainboard directory. See line 318. Honestly though we already define a "mainboard" chip, see line 131. Line 1399 already emits an include for "%s/chip.h", so I think all we really need to do is to set the `name` field on the `mainboard_chip` correctly.