[M] Change in flashrom[main]: Extract SPI declarations to the correct header

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Antonio Vázquez Blanco, David Reguera Garcia (Dreg), Matti Finder, Miklós Márton, Nikolai Artemiev, Sergii Dmytruk.

Anastasia Klimchuk has posted comments on this change by Antonio Vázquez Blanco. ( https://review.coreboot.org/c/flashrom/+/85539?usp=email )

Change subject: Extract SPI declarations to the correct header
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Patch Set 2:

(2 comments)

Patchset:

PS2: 
This is a nice clean up across the tree, thank you everyone!

Commit Message:

https://review.coreboot.org/c/flashrom/+/85539/comment/659c3b9d_3bd65290?usp... :
PS2, Line 8: 
My only comment here is that now that the patch goes across the whole tree, maybe you can add to a commit description,

to mention that after moving spi declarations some of the file don't need to include flash.h because spi.h is sufficient, and so includes of flash.h are removed where they are unnecessary.