this helper works on many different boards, so it is
good to have it in target config
Change-Id: I068deac36fdd73dbbcedffc87865cc5b9d992c1d
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-on: http://openocd.zylin.com/4422
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>