Use a command group 'parport' with subcommands instead of individual
commands with 'parport_' prefix.
The old commands are still available for backward compatibility but
marked as deprecated.
Change-Id: I4cb7096a8ba8d6cd7a6dc970862cd73c32b5c0a2
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6385
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>