makefiles/buspirate: add Bus Pirate as Debug Adapter
makefiles/buspirate: add Bus Pirate as Debug Adapter

Flash with PROGRAMMER=openocd DEBUG_ADAPTER=buspirate

ant9000/RIOT,OlegHahm/RIOT,kYc0o/RIOT,ant9000/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,authmillenon/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,miri64/RIOT,kaspar030/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kYc0o/RIOT,jasonatran/RIOT,authmillenon/RIOT,OlegHahm/RIOT,kaspar030/RIOT,miri64/RIOT,miri64/RIOT,jasonatran/RIOT,kYc0o/RIOT,kaspar030/RIOT,jasonatran/RIOT,jasonatran/RIOT,OlegHahm/RIOT,ant9000/RIOT,ant9000/RIOT,authmillenon/RIOT,ant9000/RIOT,kYc0o/RIOT,OTAkeys/RIOT,miri64/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,kaspar030/RIOT,authmillenon/RIOT,miri64/RIOT,jasonatran/RIOT,RIOT-OS/RIOT