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While at it, also rename a few functions to make it obvious
that they are generic and not specific to the Bus Pirate.

Corresponding to flashrom svn r830.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Patrick Georgi <patrick.georgi@coresystems.de>