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SPI controller on the bolton chipset uses the same 3-bit speed
settings as Yangtze, but is otherwise the same as the Hudson chips.
Note that the Bolton RRG doesn't specify a speed setting for the bit
setting of 0b111, so I'm assuming that it's the same setting as
Yangtze.

Corresponding to flashrom svn r1830.
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>