Use a command group 'jtag_dpi' with subcommands instead of individual
commands with 'jtag_dpi_' prefix.
The old commands are still available for backward compatibility but
marked as deprecated.
Change-Id: I19271546235a3c6737f975976a0bf0a2f66cbbe7
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6394
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>