Use a command group 'sysfsgpio' with subcommands instead of individual commands with 'sysfsgpio_' prefix. The old commands are still available for backward compatibility but marked as deprecated. Change-Id: I103d8d9b0e3169a916d944a999579746f6f6a59c Signed-off-by: Marc Schink <dev@zapb.de> Reviewed-on: http://openocd.zylin.com/6402 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>