gnrc_netif_ieee802154: Provide LQI, RSSI in raw mode via netif_hdr
gnrc_netif_ieee802154: Provide LQI, RSSI in raw mode via netif_hdr

Useful in sniffer situations to see the signal strength of a received
packet. Also avoids the crash described in
https://github.com/RIOT-OS/applications/pull/54

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