boards: mulle: always select periph_rtt
boards: mulle: always select periph_rtt

basilfx/RIOT,mtausig/RIOT,x3ro/RIOT,ant9000/RIOT,OlegHahm/RIOT,yogo1212/RIOT,yogo1212/RIOT,LudwigKnuepfer/RIOT,kYc0o/RIOT,authmillenon/RIOT,smlng/RIOT,kYc0o/RIOT,BytesGalore/RIOT,basilfx/RIOT,A-Paul/RIOT,gebart/RIOT,smlng/RIOT,neiljay/RIOT,A-Paul/RIOT,mfrey/RIOT,rfuentess/RIOT,immesys/RiSyn,authmillenon/RIOT,yogo1212/RIOT,miri64/RIOT,ks156/RIOT,LudwigKnuepfer/RIOT,A-Paul/RIOT,Josar/RIOT,neiljay/RIOT,yogo1212/RIOT,ant9000/RIOT,adrianghc/RIOT,roberthartung/RIOT,miri64/RIOT,LudwigOrtmann/RIOT,jasonatran/RIOT,adrianghc/RIOT,cladmi/RIOT,aeneby/RIOT,biboc/RIOT,mfrey/RIOT,authmillenon/RIOT,kbumsik/RIOT,josephnoir/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,jasonatran/RIOT,kbumsik/RIOT,BytesGalore/RIOT,kbumsik/RIOT,authmillenon/RIOT,OTAkeys/RIOT,immesys/RiSyn,biboc/RIOT,roberthartung/RIOT,rfuentess/RIOT,mtausig/RIOT,LudwigOrtmann/RIOT,immesys/RiSyn,ant9000/RIOT,cladmi/RIOT,kYc0o/RIOT,yogo1212/RIOT,miri64/RIOT,gebart/RIOT,OTAkeys/RIOT,roberthartung/RIOT,OlegHahm/RIOT,miri64/RIOT,x3ro/RIOT,cladmi/RIOT,x3ro/RIOT,LudwigOrtmann/RIOT,ks156/RIOT,RIOT-OS/RIOT,neiljay/RIOT,ant9000/RIOT,rfuentess/RIOT,basilfx/RIOT,kaspar030/RIOT,BytesGalore/RIOT,toonst/RIOT,x3ro/RIOT,Josar/RIOT,RIOT-OS/RIOT,biboc/RIOT,josephnoir/RIOT,mfrey/RIOT,authmillenon/RIOT,aeneby/RIOT,kaspar030/RIOT,smlng/RIOT,avmelnikoff/RIOT,authmillenon/RIOT,LudwigOrtmann/RIOT,lazytech-org/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,x3ro/RIOT,adrianghc/RIOT,mtausig/RIOT,basilfx/RIOT,josephnoir/RIOT,josephnoir/RIOT,neiljay/RIOT,lazytech-org/RIOT,roberthartung/RIOT,LudwigKnuepfer/RIOT,adrianghc/RIOT,A-Paul/RIOT,Josar/RIOT,kaspar030/RIOT,yogo1212/RIOT,LudwigOrtmann/RIOT,rfuentess/RIOT,aeneby/RIOT,mtausig/RIOT,lazytech-org/RIOT,cladmi/RIOT,aeneby/RIOT,avmelnikoff/RIOT,gebart/RIOT,Josar/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,gebart/RIOT,A-Paul/RIOT,ant9000/RIOT,avmelnikoff/RIOT,neiljay/RIOT,toonst/RIOT,immesys/RiSyn,cladmi/RIOT,kYc0o/RIOT,jasonatran/RIOT,mfrey/RIOT,ks156/RIOT,OlegHahm/RIOT,toonst/RIOT,LudwigOrtmann/RIOT,avmelnikoff/RIOT,basilfx/RIOT,biboc/RIOT,rfuentess/RIOT,roberthartung/RIOT,kaspar030/RIOT,miri64/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,kYc0o/RIOT,toonst/RIOT,gebart/RIOT,mfrey/RIOT,ks156/RIOT,jasonatran/RIOT,immesys/RiSyn,josephnoir/RIOT,Josar/RIOT,lazytech-org/RIOT,OlegHahm/RIOT,LudwigKnuepfer/RIOT,avmelnikoff/RIOT,kbumsik/RIOT,biboc/RIOT,immesys/RiSyn,RIOT-OS/RIOT,OTAkeys/RIOT,toonst/RIOT,kbumsik/RIOT,smlng/RIOT,smlng/RIOT,ks156/RIOT,mtausig/RIOT,BytesGalore/RIOT,jasonatran/RIOT,adrianghc/RIOT,aeneby/RIOT