Use a command group 'ulink' with subcommands instead of individual
commands with 'ulink_' prefix.
The old commands are still available for backward compatibility but
marked as deprecated.
Change-Id: I600d65de2bbd5fb8107445f7fe93b6b24c572e3e
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6392
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>