cpu/saml21: fix RTC wrong condition for #if
cpu/saml21: fix RTC wrong condition for #if

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