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On USB-based serial connections (VCP) the requested baud rate usually
does not matter (much). Remove the arbitrary restriction and use whatever
default values the OS/hardware provides.

Corresponding to flashrom svn r1907.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Urja Rannikko <urjaman@gmail.com>