fib: make FIB size dependent on existence of RPL
fib: make FIB size dependent on existence of RPL

Also, enables to configure the FIB size from the applicatin

adjih/RIOT,wentaoshang/RIOT,beurdouche/RIOT,stevenj/RIOT,wentaoshang/RIOT,adrianghc/RIOT,RBartz/RIOT,altairpearl/RIOT,authmillenon/RIOT,Yonezawa-T2/RIOT,jbeyerstedt/RIOT-OTA-update,jremmert-phytec-iot/RIOT,l3nko/RIOT,josephnoir/RIOT,BytesGalore/RIOT,mfrey/RIOT,cladmi/RIOT,lebrush/RIOT,A-Paul/RIOT,ks156/RIOT,ant9000/RIOT,mfrey/RIOT,herrfz/RIOT,kbumsik/RIOT,mziegert/RIOT,LudwigKnuepfer/RIOT,backenklee/RIOT,kaspar030/RIOT,immesys/RiSyn,A-Paul/RIOT,x3ro/RIOT,miri64/RIOT,tfar/RIOT,lazytech-org/RIOT,LudwigKnuepfer/RIOT,attdona/RIOT,dkm/RIOT,OlegHahm/RIOT,dkm/RIOT,rakendrathapa/RIOT,syin2/RIOT,asanka-code/RIOT,binarylemon/RIOT,kYc0o/RIOT,smlng/RIOT,rajma996/RIOT,RubikonAlpha/RIOT,mfrey/RIOT,TobiasFredersdorf/RIOT,TobiasFredersdorf/RIOT,rfuentess/RIOT,dhruvvyas90/RIOT,ks156/RIOT,malosek/RIOT,Yonezawa-T2/RIOT,jremmert-phytec-iot/RIOT,A-Paul/RIOT,gautric/RIOT,toonst/RIOT,LudwigOrtmann/RIOT,shady33/RIOT,attdona/RIOT,mtausig/RIOT,kb2ma/RIOT,ant9000/RIOT,d00616/RIOT,l3nko/RIOT,LudwigOrtmann/RIOT,malosek/RIOT,miri64/RIOT,mziegert/RIOT,zhuoshuguo/RIOT,neumodisch/RIOT,tfar/RIOT,dailab/RIOT,Yonezawa-T2/RIOT,katezilla/RIOT,jfischer-phytec-iot/RIOT,jbeyerstedt/RIOT-OTA-update,plushvoxel/RIOT,rousselk/RIOT,lebrush/RIOT,syin2/RIOT,malosek/RIOT,attdona/RIOT,asanka-code/RIOT,kbumsik/RIOT,hamilton-mote/RIOT-OS,mfrey/RIOT,gebart/RIOT,altairpearl/RIOT,roberthartung/RIOT,cladmi/RIOT,katezilla/RIOT,tfar/RIOT,basilfx/RIOT,kbumsik/RIOT,herrfz/RIOT,cladmi/RIOT,x3ro/RIOT,rakendrathapa/RIOT,kbumsik/RIOT,RBartz/RIOT,OTAkeys/RIOT,josephnoir/RIOT,katezilla/RIOT,dailab/RIOT,FrancescoErmini/RIOT,lazytech-org/RIOT,Yonezawa-T2/RIOT,biboc/RIOT,zhuoshuguo/RIOT,lebrush/RIOT,toonst/RIOT,kb2ma/RIOT,thomaseichinger/RIOT,jremmert-phytec-iot/RIOT,kaleb-himes/RIOT,toonst/RIOT,dkm/RIOT,Yonezawa-T2/RIOT,dhruvvyas90/RIOT,A-Paul/RIOT,MohmadAyman/RIOT,RIOT-OS/RIOT,RBartz/RIOT,adjih/RIOT,alignan/RIOT,yogo1212/RIOT,Ell-i/RIOT,katezilla/RIOT,immesys/RiSyn,alignan/RIOT,Hyungsin/RIOT-OS,toonst/RIOT,ks156/RIOT,beurdouche/RIOT,Ell-i/RIOT,jasonatran/RIOT,gautric/RIOT,hamilton-mote/RIOT-OS,stevenj/RIOT,wentaoshang/RIOT,LudwigOrtmann/RIOT,gautric/RIOT,alignan/RIOT,mtausig/RIOT,kbumsik/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,l3nko/RIOT,plushvoxel/RIOT,A-Paul/RIOT,rousselk/RIOT,attdona/RIOT,adrianghc/RIOT,BytesGalore/RIOT,jasonatran/RIOT,FrancescoErmini/RIOT,adrianghc/RIOT,rakendrathapa/RIOT,authmillenon/RIOT,stevenj/RIOT,jbeyerstedt/RIOT-OTA-update,RubikonAlpha/RIOT,RubikonAlpha/RIOT,BytesGalore/RIOT,dhruvvyas90/RIOT,avmelnikoff/RIOT,brettswann/RIOT,LudwigKnuepfer/RIOT,altairpearl/RIOT,gebart/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,kaspar030/RIOT,thomaseichinger/RIOT,asanka-code/RIOT,jremmert-phytec-iot/RIOT,binarylemon/RIOT,BytesGalore/RIOT,FrancescoErmini/RIOT,OlegHahm/RIOT,immesys/RiSyn,malosek/RIOT,rousselk/RIOT,roberthartung/RIOT,kaspar030/RIOT,Ell-i/RIOT,OlegHahm/RIOT,RBartz/RIOT,x3ro/RIOT,rfuentess/RIOT,brettswann/RIOT,RubikonAlpha/RIOT,gebart/RIOT,hamilton-mote/RIOT-OS,Josar/RIOT,attdona/RIOT,kb2ma/RIOT,altairpearl/RIOT,d00616/RIOT,Ell-i/RIOT,Hyungsin/RIOT-OS,jbeyerstedt/RIOT-OTA-update,dhruvvyas90/RIOT,plushvoxel/RIOT,OlegHahm/RIOT,kerneltask/RIOT,syin2/RIOT,altairpearl/RIOT,neumodisch/RIOT,shady33/RIOT,dailab/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,aeneby/RIOT,mziegert/RIOT,RubikonAlpha/RIOT,brettswann/RIOT,stevenj/RIOT,kaleb-himes/RIOT,binarylemon/RIOT,herrfz/RIOT,neiljay/RIOT,mziegert/RIOT,cladmi/RIOT,Hyungsin/RIOT-OS,MohmadAyman/RIOT,josephnoir/RIOT,adjih/RIOT,herrfz/RIOT,jasonatran/RIOT,tfar/RIOT,yogo1212/RIOT,stevenj/RIOT,rajma996/RIOT,RBartz/RIOT,asanka-code/RIOT,lazytech-org/RIOT,jbeyerstedt/RIOT-OTA-update,d00616/RIOT,mtausig/RIOT,neumodisch/RIOT,beurdouche/RIOT,LudwigKnuepfer/RIOT,rakendrathapa/RIOT,basilfx/RIOT,brettswann/RIOT,kb2ma/RIOT,zhuoshuguo/RIOT,roberthartung/RIOT,kb2ma/RIOT,dailab/RIOT,ant9000/RIOT,LudwigKnuepfer/RIOT,mfrey/RIOT,basilfx/RIOT,avmelnikoff/RIOT,zhuoshuguo/RIOT,neumodisch/RIOT,jfischer-phytec-iot/RIOT,basilfx/RIOT,FrancescoErmini/RIOT,MohmadAyman/RIOT,beurdouche/RIOT,kaleb-himes/RIOT,plushvoxel/RIOT,kerneltask/RIOT,miri64/RIOT,RubikonAlpha/RIOT,plushvoxel/RIOT,jasonatran/RIOT,malosek/RIOT,BytesGalore/RIOT,ant9000/RIOT,kerneltask/RIOT,Hyungsin/RIOT-OS,asanka-code/RIOT,cladmi/RIOT,dkm/RIOT,kerneltask/RIOT,shady33/RIOT,jfischer-phytec-iot/RIOT,l3nko/RIOT,rakendrathapa/RIOT,kYc0o/RIOT,neumodisch/RIOT,roberthartung/RIOT,binarylemon/RIOT,jremmert-phytec-iot/RIOT,miri64/RIOT,rajma996/RIOT,OTAkeys/RIOT,gebart/RIOT,LudwigOrtmann/RIOT,lebrush/RIOT,tfar/RIOT,rajma996/RIOT,Yonezawa-T2/RIOT,TobiasFredersdorf/RIOT,rfuentess/RIOT,wentaoshang/RIOT,immesys/RiSyn,stevenj/RIOT,aeneby/RIOT,MohmadAyman/RIOT,asanka-code/RIOT,rajma996/RIOT,Josar/RIOT,gebart/RIOT,dkm/RIOT,gautric/RIOT,rakendrathapa/RIOT,mziegert/RIOT,lazytech-org/RIOT,toonst/RIOT,yogo1212/RIOT,biboc/RIOT,FrancescoErmini/RIOT,josephnoir/RIOT,Hyungsin/RIOT-OS,syin2/RIOT,kaleb-himes/RIOT,neiljay/RIOT,malosek/RIOT,lazytech-org/RIOT,avmelnikoff/RIOT,alignan/RIOT,katezilla/RIOT,rajma996/RIOT,OTAkeys/RIOT,Josar/RIOT,binarylemon/RIOT,MohmadAyman/RIOT,OlegHahm/RIOT,smlng/RIOT,dailab/RIOT,avmelnikoff/RIOT,yogo1212/RIOT,Josar/RIOT,lebrush/RIOT,hamilton-mote/RIOT-OS,hamilton-mote/RIOT-OS,OTAkeys/RIOT,ks156/RIOT,adjih/RIOT,rfuentess/RIOT,yogo1212/RIOT,MohmadAyman/RIOT,herrfz/RIOT,rousselk/RIOT,backenklee/RIOT,immesys/RiSyn,backenklee/RIOT,Ell-i/RIOT,thomaseichinger/RIOT,d00616/RIOT,l3nko/RIOT,syin2/RIOT,rousselk/RIOT,smlng/RIOT,kaspar030/RIOT,neiljay/RIOT,neiljay/RIOT,dhruvvyas90/RIOT,shady33/RIOT,herrfz/RIOT,RIOT-OS/RIOT,neiljay/RIOT,kYc0o/RIOT,adrianghc/RIOT,authmillenon/RIOT,shady33/RIOT,smlng/RIOT,adjih/RIOT,FrancescoErmini/RIOT,mziegert/RIOT,avmelnikoff/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,beurdouche/RIOT,kYc0o/RIOT,neumodisch/RIOT,kaleb-himes/RIOT,thomaseichinger/RIOT,thomaseichinger/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,d00616/RIOT,rousselk/RIOT,wentaoshang/RIOT,authmillenon/RIOT,shady33/RIOT,roberthartung/RIOT,zhuoshuguo/RIOT,authmillenon/RIOT,yogo1212/RIOT,jfischer-phytec-iot/RIOT,kaspar030/RIOT,d00616/RIOT,authmillenon/RIOT,immesys/RiSyn,backenklee/RIOT,brettswann/RIOT,aeneby/RIOT,x3ro/RIOT,kerneltask/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Josar/RIOT,jasonatran/RIOT,l3nko/RIOT,TobiasFredersdorf/RIOT,basilfx/RIOT,mtausig/RIOT,attdona/RIOT,aeneby/RIOT,x3ro/RIOT,biboc/RIOT,zhuoshuguo/RIOT,miri64/RIOT,gautric/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,RBartz/RIOT,LudwigOrtmann/RIOT,ks156/RIOT,ant9000/RIOT,dhruvvyas90/RIOT,smlng/RIOT,RIOT-OS/RIOT,mtausig/RIOT,jfischer-phytec-iot/RIOT,binarylemon/RIOT,wentaoshang/RIOT,jremmert-phytec-iot/RIOT,biboc/RIOT,josephnoir/RIOT,adrianghc/RIOT,aeneby/RIOT,lebrush/RIOT,rfuentess/RIOT,TobiasFredersdorf/RIOT,biboc/RIOT,brettswann/RIOT,alignan/RIOT,altairpearl/RIOT,LudwigOrtmann/RIOT,backenklee/RIOT