tests/driver_pca9685: add atmega32u4 boards to Makefile.ci
tests/driver_pca9685: add atmega32u4 boards to Makefile.ci

fixed shell is too big for atmega32u4 based boards

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