cpu/saml21: set PL2 by default
cpu/saml21: set PL2 by default

kaspar030/RIOT,rfuentess/RIOT,kYc0o/RIOT,ant9000/RIOT,kYc0o/RIOT,cladmi/RIOT,OlegHahm/RIOT,jasonatran/RIOT,mfrey/RIOT,x3ro/RIOT,josephnoir/RIOT,smlng/RIOT,cladmi/RIOT,basilfx/RIOT,toonst/RIOT,basilfx/RIOT,smlng/RIOT,mfrey/RIOT,rfuentess/RIOT,jasonatran/RIOT,jasonatran/RIOT,yogo1212/RIOT,aeneby/RIOT,ant9000/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,rfuentess/RIOT,mtausig/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,toonst/RIOT,cladmi/RIOT,toonst/RIOT,mfrey/RIOT,kYc0o/RIOT,yogo1212/RIOT,OTAkeys/RIOT,ant9000/RIOT,x3ro/RIOT,authmillenon/RIOT,smlng/RIOT,OlegHahm/RIOT,miri64/RIOT,x3ro/RIOT,aeneby/RIOT,miri64/RIOT,mfrey/RIOT,rfuentess/RIOT,OTAkeys/RIOT,toonst/RIOT,ant9000/RIOT,kaspar030/RIOT,OlegHahm/RIOT,mtausig/RIOT,aeneby/RIOT,mtausig/RIOT,cladmi/RIOT,ant9000/RIOT,authmillenon/RIOT,mfrey/RIOT,smlng/RIOT,OlegHahm/RIOT,basilfx/RIOT,rfuentess/RIOT,kaspar030/RIOT,jasonatran/RIOT,mtausig/RIOT,mtausig/RIOT,kaspar030/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,basilfx/RIOT,x3ro/RIOT,miri64/RIOT,kYc0o/RIOT,authmillenon/RIOT,kaspar030/RIOT,cladmi/RIOT,authmillenon/RIOT,x3ro/RIOT,toonst/RIOT,OTAkeys/RIOT,authmillenon/RIOT,yogo1212/RIOT,basilfx/RIOT,yogo1212/RIOT,josephnoir/RIOT,josephnoir/RIOT,aeneby/RIOT,aeneby/RIOT,kYc0o/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,smlng/RIOT,miri64/RIOT,miri64/RIOT,jasonatran/RIOT,authmillenon/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT