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The type describes one entry of the whole layout actually.
Using layout_entry_t or something similar would be more correct,
but due to it length we will use "rom" instead of "layout" here and
in upcoming code.

Corresponding to flashrom svn r1732.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>