gnrc_netdev2: remove unrequired forward declaration
gnrc_netdev2: remove unrequired forward declaration

stevenj/RIOT,brettswann/RIOT,A-Paul/RIOT,hamilton-mote/RIOT-OS,jremmert-phytec-iot/RIOT,adjih/RIOT,immesys/RiSyn,OlegHahm/RIOT,kerneltask/RIOT,rfuentess/RIOT,basilfx/RIOT,malosek/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,dkm/RIOT,wentaoshang/RIOT,tfar/RIOT,backenklee/RIOT,gautric/RIOT,plushvoxel/RIOT,x3ro/RIOT,cladmi/RIOT,josephnoir/RIOT,jbeyerstedt/RIOT-OTA-update,gebart/RIOT,adjih/RIOT,avmelnikoff/RIOT,shady33/RIOT,adjih/RIOT,RBartz/RIOT,kerneltask/RIOT,neumodisch/RIOT,smlng/RIOT,plushvoxel/RIOT,lebrush/RIOT,katezilla/RIOT,thomaseichinger/RIOT,stevenj/RIOT,attdona/RIOT,rousselk/RIOT,jbeyerstedt/RIOT-OTA-update,kaspar030/RIOT,Ell-i/RIOT,kerneltask/RIOT,toonst/RIOT,ks156/RIOT,miri64/RIOT,asanka-code/RIOT,brettswann/RIOT,dailab/RIOT,gebart/RIOT,mfrey/RIOT,rakendrathapa/RIOT,l3nko/RIOT,zhuoshuguo/RIOT,ks156/RIOT,LudwigKnuepfer/RIOT,stevenj/RIOT,yogo1212/RIOT,dkm/RIOT,LudwigKnuepfer/RIOT,TobiasFredersdorf/RIOT,kaleb-himes/RIOT,MohmadAyman/RIOT,dailab/RIOT,lebrush/RIOT,adrianghc/RIOT,zhuoshuguo/RIOT,neumodisch/RIOT,hamilton-mote/RIOT-OS,Yonezawa-T2/RIOT,jbeyerstedt/RIOT-OTA-update,rakendrathapa/RIOT,TobiasFredersdorf/RIOT,tfar/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,biboc/RIOT,biboc/RIOT,LudwigOrtmann/RIOT,mziegert/RIOT,dkm/RIOT,mziegert/RIOT,immesys/RiSyn,rajma996/RIOT,biboc/RIOT,alignan/RIOT,authmillenon/RIOT,adrianghc/RIOT,Yonezawa-T2/RIOT,BytesGalore/RIOT,tfar/RIOT,neiljay/RIOT,smlng/RIOT,kYc0o/RIOT,asanka-code/RIOT,josephnoir/RIOT,ant9000/RIOT,x3ro/RIOT,aeneby/RIOT,rfuentess/RIOT,neiljay/RIOT,backenklee/RIOT,shady33/RIOT,katezilla/RIOT,avmelnikoff/RIOT,backenklee/RIOT,jfischer-phytec-iot/RIOT,brettswann/RIOT,RIOT-OS/RIOT,Josar/RIOT,jfischer-phytec-iot/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,yogo1212/RIOT,LudwigKnuepfer/RIOT,l3nko/RIOT,Yonezawa-T2/RIOT,LudwigOrtmann/RIOT,zhuoshuguo/RIOT,basilfx/RIOT,hamilton-mote/RIOT-OS,immesys/RiSyn,thomaseichinger/RIOT,kYc0o/RIOT,gautric/RIOT,x3ro/RIOT,OTAkeys/RIOT,backenklee/RIOT,toonst/RIOT,mtausig/RIOT,lebrush/RIOT,avmelnikoff/RIOT,lazytech-org/RIOT,beurdouche/RIOT,backenklee/RIOT,l3nko/RIOT,gautric/RIOT,l3nko/RIOT,binarylemon/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,authmillenon/RIOT,stevenj/RIOT,toonst/RIOT,jasonatran/RIOT,neiljay/RIOT,FrancescoErmini/RIOT,kaleb-himes/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,brettswann/RIOT,rakendrathapa/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,kaspar030/RIOT,tfar/RIOT,cladmi/RIOT,RBartz/RIOT,neiljay/RIOT,lazytech-org/RIOT,alignan/RIOT,d00616/RIOT,jasonatran/RIOT,kb2ma/RIOT,Josar/RIOT,kYc0o/RIOT,OlegHahm/RIOT,mtausig/RIOT,BytesGalore/RIOT,Yonezawa-T2/RIOT,altairpearl/RIOT,tfar/RIOT,neiljay/RIOT,shady33/RIOT,adrianghc/RIOT,josephnoir/RIOT,RubikonAlpha/RIOT,l3nko/RIOT,brettswann/RIOT,hamilton-mote/RIOT-OS,biboc/RIOT,wentaoshang/RIOT,adjih/RIOT,wentaoshang/RIOT,MohmadAyman/RIOT,wentaoshang/RIOT,mtausig/RIOT,RBartz/RIOT,rousselk/RIOT,yogo1212/RIOT,kYc0o/RIOT,kaleb-himes/RIOT,kbumsik/RIOT,neumodisch/RIOT,LudwigOrtmann/RIOT,lazytech-org/RIOT,malosek/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,roberthartung/RIOT,x3ro/RIOT,plushvoxel/RIOT,immesys/RiSyn,kbumsik/RIOT,stevenj/RIOT,avmelnikoff/RIOT,malosek/RIOT,MohmadAyman/RIOT,ant9000/RIOT,FrancescoErmini/RIOT,zhuoshuguo/RIOT,kaleb-himes/RIOT,authmillenon/RIOT,malosek/RIOT,rajma996/RIOT,aeneby/RIOT,Hyungsin/RIOT-OS,shady33/RIOT,katezilla/RIOT,mfrey/RIOT,jbeyerstedt/RIOT-OTA-update,ks156/RIOT,avmelnikoff/RIOT,katezilla/RIOT,Hyungsin/RIOT-OS,jbeyerstedt/RIOT-OTA-update,asanka-code/RIOT,immesys/RiSyn,authmillenon/RIOT,attdona/RIOT,RBartz/RIOT,LudwigKnuepfer/RIOT,mziegert/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,miri64/RIOT,Ell-i/RIOT,syin2/RIOT,rajma996/RIOT,stevenj/RIOT,gautric/RIOT,altairpearl/RIOT,plushvoxel/RIOT,adjih/RIOT,syin2/RIOT,rousselk/RIOT,syin2/RIOT,mfrey/RIOT,binarylemon/RIOT,Josar/RIOT,ks156/RIOT,rakendrathapa/RIOT,cladmi/RIOT,dkm/RIOT,basilfx/RIOT,RIOT-OS/RIOT,miri64/RIOT,MohmadAyman/RIOT,neumodisch/RIOT,mfrey/RIOT,alignan/RIOT,RBartz/RIOT,binarylemon/RIOT,mfrey/RIOT,alignan/RIOT,kb2ma/RIOT,LudwigOrtmann/RIOT,beurdouche/RIOT,RBartz/RIOT,basilfx/RIOT,rfuentess/RIOT,jasonatran/RIOT,aeneby/RIOT,RubikonAlpha/RIOT,Josar/RIOT,rousselk/RIOT,altairpearl/RIOT,d00616/RIOT,cladmi/RIOT,katezilla/RIOT,rousselk/RIOT,mziegert/RIOT,dailab/RIOT,binarylemon/RIOT,Ell-i/RIOT,syin2/RIOT,attdona/RIOT,mziegert/RIOT,kb2ma/RIOT,attdona/RIOT,LudwigOrtmann/RIOT,d00616/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,jasonatran/RIOT,MohmadAyman/RIOT,shady33/RIOT,OTAkeys/RIOT,smlng/RIOT,RubikonAlpha/RIOT,asanka-code/RIOT,kb2ma/RIOT,l3nko/RIOT,FrancescoErmini/RIOT,aeneby/RIOT,Yonezawa-T2/RIOT,miri64/RIOT,kaspar030/RIOT,kaspar030/RIOT,TobiasFredersdorf/RIOT,FrancescoErmini/RIOT,roberthartung/RIOT,d00616/RIOT,Ell-i/RIOT,beurdouche/RIOT,altairpearl/RIOT,MohmadAyman/RIOT,kYc0o/RIOT,josephnoir/RIOT,miri64/RIOT,lebrush/RIOT,RubikonAlpha/RIOT,attdona/RIOT,A-Paul/RIOT,Hyungsin/RIOT-OS,rajma996/RIOT,gebart/RIOT,Yonezawa-T2/RIOT,roberthartung/RIOT,ant9000/RIOT,roberthartung/RIOT,dailab/RIOT,lazytech-org/RIOT,neumodisch/RIOT,jremmert-phytec-iot/RIOT,rfuentess/RIOT,lebrush/RIOT,OlegHahm/RIOT,jremmert-phytec-iot/RIOT,yogo1212/RIOT,gautric/RIOT,gebart/RIOT,hamilton-mote/RIOT-OS,lebrush/RIOT,kbumsik/RIOT,rajma996/RIOT,smlng/RIOT,A-Paul/RIOT,kaleb-himes/RIOT,Josar/RIOT,dkm/RIOT,BytesGalore/RIOT,kerneltask/RIOT,brettswann/RIOT,rfuentess/RIOT,beurdouche/RIOT,RubikonAlpha/RIOT,rakendrathapa/RIOT,attdona/RIOT,Hyungsin/RIOT-OS,immesys/RiSyn,Ell-i/RIOT,biboc/RIOT,binarylemon/RIOT,shady33/RIOT,altairpearl/RIOT,FrancescoErmini/RIOT,alignan/RIOT,adrianghc/RIOT,TobiasFredersdorf/RIOT,cladmi/RIOT,authmillenon/RIOT,dailab/RIOT,TobiasFredersdorf/RIOT,plushvoxel/RIOT,malosek/RIOT,smlng/RIOT,adrianghc/RIOT,rajma996/RIOT,ks156/RIOT,roberthartung/RIOT,rousselk/RIOT,OlegHahm/RIOT,kbumsik/RIOT,RIOT-OS/RIOT,malosek/RIOT,OTAkeys/RIOT,mtausig/RIOT,kb2ma/RIOT,x3ro/RIOT,jremmert-phytec-iot/RIOT,mziegert/RIOT,wentaoshang/RIOT,d00616/RIOT,josephnoir/RIOT,OlegHahm/RIOT,rakendrathapa/RIOT,OTAkeys/RIOT,kerneltask/RIOT,thomaseichinger/RIOT,d00616/RIOT,binarylemon/RIOT,mtausig/RIOT,wentaoshang/RIOT,jfischer-phytec-iot/RIOT,jfischer-phytec-iot/RIOT,toonst/RIOT,ant9000/RIOT,kaspar030/RIOT,OTAkeys/RIOT,asanka-code/RIOT,aeneby/RIOT,toonst/RIOT,LudwigOrtmann/RIOT,yogo1212/RIOT,gebart/RIOT,jasonatran/RIOT,authmillenon/RIOT,neumodisch/RIOT,jfischer-phytec-iot/RIOT,ant9000/RIOT,jremmert-phytec-iot/RIOT,beurdouche/RIOT,basilfx/RIOT,BytesGalore/RIOT,Hyungsin/RIOT-OS,RubikonAlpha/RIOT,asanka-code/RIOT,zhuoshuguo/RIOT,kbumsik/RIOT,altairpearl/RIOT,zhuoshuguo/RIOT,syin2/RIOT,jremmert-phytec-iot/RIOT,FrancescoErmini/RIOT,LudwigKnuepfer/RIOT,lazytech-org/RIOT