boards/arduino-duemilanove: Refactor avrdude conf
boards/arduino-duemilanove: Refactor avrdude conf

jasonatran/RIOT,yogo1212/RIOT,kYc0o/RIOT,kYc0o/RIOT,basilfx/RIOT,OTAkeys/RIOT,yogo1212/RIOT,miri64/RIOT,kaspar030/RIOT,smlng/RIOT,miri64/RIOT,yogo1212/RIOT,miri64/RIOT,OlegHahm/RIOT,kYc0o/RIOT,ant9000/RIOT,jasonatran/RIOT,ant9000/RIOT,smlng/RIOT,ant9000/RIOT,RIOT-OS/RIOT,basilfx/RIOT,miri64/RIOT,yogo1212/RIOT,kaspar030/RIOT,ant9000/RIOT,OTAkeys/RIOT,kaspar030/RIOT,smlng/RIOT,smlng/RIOT,kYc0o/RIOT,authmillenon/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,basilfx/RIOT,miri64/RIOT,ant9000/RIOT,authmillenon/RIOT,basilfx/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,jasonatran/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,basilfx/RIOT,smlng/RIOT,jasonatran/RIOT,kaspar030/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,authmillenon/RIOT,authmillenon/RIOT,OlegHahm/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,jasonatran/RIOT,authmillenon/RIOT,yogo1212/RIOT