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This adds an optional argument when using the ft2232_spi programmer to set
the frequency divisor. The valid values for the divisor is any even integer
between 2 and 131072.

Corresponding to flashrom svn r1537.
Signed-off-by: Samir Ibradžić <sibradzic@gmail.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>