Use a command group 'ft232r' with subcommands instead of individual
commands with 'ft232r_' prefix.
The old commands are still available for backward compatibility but
marked as deprecated.
Change-Id: I0dbeb4716330c83f8ce89b0d054eb0286b887bdf
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6409
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>