netstats_l2: remove obsolete struct from xbee_t
netstats_l2: remove obsolete struct from xbee_t

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