saul_reg: define saul_reg_t dev field as a pointer to const
saul_reg: define saul_reg_t dev field as a pointer to const

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