drivers/tsl2561: add missing acquire∕release functions
drivers/tsl2561: add missing acquire∕release functions

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