Use a command group 'bcm2835gpio' with subcommands instead of individual
commands with 'bcm2835gpio_' prefix.
The old commands are still available for backward compatibility but
marked as deprecated.
Change-Id: I8f7b14273b1b2813ac3c9704605d175fa2053008
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: http://openocd.zylin.com/6396
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>