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Move some suitable functions there, add it to the Makefile, but leave the
declarations in flash.h for now.

Corresponding to flashrom svn r1819.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>