Change in flashrom[staging]: Constify arguments in flashrom_image_* prototypes

[Nico Huber (Code Review)]

Nico Huber has posted comments on this change. ( https://review.coreboot.org/20812 )

Change subject: Constify arguments in flashrom_image_* prototypes
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Patch Set 1:

Um, actually I omitted the consts on purpose. They are not part of the
signature. Since everything is passed by value in C, it makes no dif-
ference for the caller if we are going to change our copy of the argu-
ment or not.

I don't have strong feelings about it though. Just the commit message
should change if you want to change it nevertheless.