makefiles/tools: Allow make reset via avrdude
makefiles/tools: Allow make reset via avrdude

In order to flash AVR devices, avrdude needs the ability to reset them:
Those using a bootloader will only enter it after a reset, and those programmed
via ISP also need a reset to enter ISP mode.

Sadly, avrdude has no option to reset the board. But running it without commands
will read and print the boards identification and fuse settings. For this, as
reset is needed. This commit uses this side-effect reset to implement make reset
for all AVR based boards

miri64/RIOT,kYc0o/RIOT,jasonatran/RIOT,yogo1212/RIOT,kaspar030/RIOT,smlng/RIOT,kYc0o/RIOT,miri64/RIOT,RIOT-OS/RIOT,mtausig/RIOT,ant9000/RIOT,aeneby/RIOT,OTAkeys/RIOT,mtausig/RIOT,aeneby/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,mtausig/RIOT,toonst/RIOT,miri64/RIOT,OlegHahm/RIOT,basilfx/RIOT,ant9000/RIOT,smlng/RIOT,kYc0o/RIOT,kYc0o/RIOT,kaspar030/RIOT,aeneby/RIOT,kaspar030/RIOT,yogo1212/RIOT,toonst/RIOT,authmillenon/RIOT,ant9000/RIOT,basilfx/RIOT,yogo1212/RIOT,mtausig/RIOT,jasonatran/RIOT,aeneby/RIOT,smlng/RIOT,OlegHahm/RIOT,basilfx/RIOT,jasonatran/RIOT,authmillenon/RIOT,kYc0o/RIOT,mtausig/RIOT,OTAkeys/RIOT,yogo1212/RIOT,smlng/RIOT,x3ro/RIOT,jasonatran/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,miri64/RIOT,authmillenon/RIOT,toonst/RIOT,josephnoir/RIOT,toonst/RIOT,basilfx/RIOT,RIOT-OS/RIOT,x3ro/RIOT,x3ro/RIOT,ant9000/RIOT,miri64/RIOT,x3ro/RIOT,smlng/RIOT,josephnoir/RIOT,OTAkeys/RIOT,josephnoir/RIOT,jasonatran/RIOT,OlegHahm/RIOT,x3ro/RIOT,OlegHahm/RIOT,josephnoir/RIOT,yogo1212/RIOT,kaspar030/RIOT,OlegHahm/RIOT,toonst/RIOT,OTAkeys/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,basilfx/RIOT,ant9000/RIOT,authmillenon/RIOT,yogo1212/RIOT,authmillenon/RIOT,aeneby/RIOT