[flashrom-gerrit] Change in flashrom[staging]: ich_descriptors: Fix off-by-one error

[David Hendricks (Code Review)]

David Hendricks has posted comments on this change. ( https://review.coreboot.org/20937 )

Change subject: ich_descriptors: Fix off-by-one error
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Patch Set 1: Code-Review-2

Out of caution, I went ahead and added Lewisburg as its own ICH in https://review.coreboot.org/#/c/20922/ . So far the only notable differences I've come across are the number of masters and maybe the number of protected range registers. Let's discuss further in 20922.