boards/arduino-mkr*: fix order in struct
boards/arduino-mkr*: fix order in struct

        C++ requires to init struct attributes in order of there definition
        in the respective struct.

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