jiminy-mega256rfr2: configure BOOTLOADER_SIZE
jiminy-mega256rfr2: configure BOOTLOADER_SIZE

Value comes the maintainer.

miri64/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,kaspar030/RIOT,kbumsik/RIOT,mtausig/RIOT,cladmi/RIOT,authmillenon/RIOT,cladmi/RIOT,A-Paul/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,aeneby/RIOT,yogo1212/RIOT,rfuentess/RIOT,kYc0o/RIOT,toonst/RIOT,smlng/RIOT,smlng/RIOT,BytesGalore/RIOT,avmelnikoff/RIOT,RIOT-OS/RIOT,toonst/RIOT,OTAkeys/RIOT,mfrey/RIOT,A-Paul/RIOT,basilfx/RIOT,jasonatran/RIOT,basilfx/RIOT,A-Paul/RIOT,miri64/RIOT,A-Paul/RIOT,lazytech-org/RIOT,OlegHahm/RIOT,BytesGalore/RIOT,kYc0o/RIOT,avmelnikoff/RIOT,gebart/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,basilfx/RIOT,avmelnikoff/RIOT,ant9000/RIOT,smlng/RIOT,authmillenon/RIOT,OTAkeys/RIOT,mtausig/RIOT,biboc/RIOT,gebart/RIOT,ant9000/RIOT,rfuentess/RIOT,miri64/RIOT,OTAkeys/RIOT,toonst/RIOT,gebart/RIOT,mfrey/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,smlng/RIOT,jasonatran/RIOT,kbumsik/RIOT,mtausig/RIOT,basilfx/RIOT,yogo1212/RIOT,josephnoir/RIOT,biboc/RIOT,x3ro/RIOT,biboc/RIOT,lazytech-org/RIOT,OlegHahm/RIOT,x3ro/RIOT,yogo1212/RIOT,gebart/RIOT,aeneby/RIOT,authmillenon/RIOT,kaspar030/RIOT,A-Paul/RIOT,authmillenon/RIOT,josephnoir/RIOT,OTAkeys/RIOT,aeneby/RIOT,jasonatran/RIOT,mtausig/RIOT,x3ro/RIOT,cladmi/RIOT,BytesGalore/RIOT,rfuentess/RIOT,mfrey/RIOT,jasonatran/RIOT,kYc0o/RIOT,basilfx/RIOT,biboc/RIOT,mfrey/RIOT,miri64/RIOT,x3ro/RIOT,yogo1212/RIOT,kaspar030/RIOT,kbumsik/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,biboc/RIOT,miri64/RIOT,lazytech-org/RIOT,ant9000/RIOT,mtausig/RIOT,ant9000/RIOT,toonst/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,avmelnikoff/RIOT,BytesGalore/RIOT,kYc0o/RIOT,toonst/RIOT,kYc0o/RIOT,rfuentess/RIOT,BytesGalore/RIOT,kaspar030/RIOT,kbumsik/RIOT,gebart/RIOT,x3ro/RIOT,OlegHahm/RIOT,aeneby/RIOT,kbumsik/RIOT,lazytech-org/RIOT,avmelnikoff/RIOT,josephnoir/RIOT,smlng/RIOT,josephnoir/RIOT,cladmi/RIOT,authmillenon/RIOT,ant9000/RIOT,kaspar030/RIOT,rfuentess/RIOT,aeneby/RIOT,yogo1212/RIOT,mfrey/RIOT,cladmi/RIOT