boards/common/nrf52xxxdk: guard SAUL GPIO mappings
boards/common/nrf52xxxdk: guard SAUL GPIO mappings

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