[coreboot] Kconfig: Move `CBFS_SIZE` out of main section

[Peter Stuge]

Julius Werner wrote:
> > What section should
> >
> >         (0x400000) Size of CBFS filesystem in ROM
> >
> > be moved to?
> 
> The option is closely related to ROM_SIZE, so maybe put it under
> 'Mainboard -->' with that?

Sounds good.


> > Furthermore, should it even be visible or be hidden as an expert option?
> 
> Hiding it as an expert option probably makes sense. It is used to
> restrict the amount of space coreboot (CBFS) takes up on the ROM in
> case you want to put other stuff on there as well, which is probably a
> pretty limited use case.

I think making it depend on EXPERT is a great idea.

I'd also like the interface to be friendlier. What granularity is
actually supported for the option? I doubt that it's single bytes?

Maybe make it decimal kb? The default value depends on ROM_SIZE, right?


//Peter