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

[Karthik Ramasubramanian (Code Review)]

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

Karthik Ramasubramanian 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/334087b4_88cfb352 
PS1, Line 9: Include
> Honestly though we already define a "mainboard" chip,

That mainboard chip is intended to be private to sconfig. Atleast it looks so with it being static. Also with the name already defined, that chip is intended is an agnostic representation of the mainboard and a placeholder chip for the root device. So not sure if it is ok to change the name of the mainboard. Even if it is ok, how to change the name of the mainboard without adding another keyword. The name has to be updated before sconfig starts emitting static.c file.