kw2xrf: Fetch short addr from device
kw2xrf: Fetch short addr from device

This change modifies the kw2xrf_get_addr_short function to retrieve the
short address from the device and not from netdev

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