cpu: cortexm: add Makefile.features
cpu: cortexm: add Makefile.features

mfrey/RIOT,LudwigKnuepfer/RIOT,gebart/RIOT,OTAkeys/RIOT,kaspar030/RIOT,jasonatran/RIOT,mfrey/RIOT,rfuentess/RIOT,ant9000/RIOT,authmillenon/RIOT,josephnoir/RIOT,roberthartung/RIOT,jasonatran/RIOT,basilfx/RIOT,avmelnikoff/RIOT,neiljay/RIOT,kYc0o/RIOT,LudwigKnuepfer/RIOT,jasonatran/RIOT,kYc0o/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,roberthartung/RIOT,toonst/RIOT,LudwigOrtmann/RIOT,adrianghc/RIOT,mtausig/RIOT,miri64/RIOT,cladmi/RIOT,cladmi/RIOT,ks156/RIOT,aeneby/RIOT,adrianghc/RIOT,kaspar030/RIOT,mtausig/RIOT,LudwigKnuepfer/RIOT,kbumsik/RIOT,OlegHahm/RIOT,Josar/RIOT,LudwigOrtmann/RIOT,biboc/RIOT,aeneby/RIOT,A-Paul/RIOT,biboc/RIOT,OTAkeys/RIOT,x3ro/RIOT,biboc/RIOT,BytesGalore/RIOT,roberthartung/RIOT,smlng/RIOT,LudwigOrtmann/RIOT,OTAkeys/RIOT,cladmi/RIOT,authmillenon/RIOT,toonst/RIOT,Josar/RIOT,immesys/RiSyn,x3ro/RIOT,lazytech-org/RIOT,RIOT-OS/RIOT,ks156/RIOT,smlng/RIOT,OlegHahm/RIOT,adrianghc/RIOT,basilfx/RIOT,josephnoir/RIOT,immesys/RiSyn,x3ro/RIOT,OlegHahm/RIOT,josephnoir/RIOT,mfrey/RIOT,miri64/RIOT,authmillenon/RIOT,rfuentess/RIOT,OTAkeys/RIOT,LudwigKnuepfer/RIOT,kaspar030/RIOT,lazytech-org/RIOT,mfrey/RIOT,gebart/RIOT,avmelnikoff/RIOT,roberthartung/RIOT,LudwigKnuepfer/RIOT,Josar/RIOT,jasonatran/RIOT,avmelnikoff/RIOT,aeneby/RIOT,mtausig/RIOT,aeneby/RIOT,kbumsik/RIOT,kbumsik/RIOT,smlng/RIOT,miri64/RIOT,josephnoir/RIOT,ks156/RIOT,biboc/RIOT,gebart/RIOT,OlegHahm/RIOT,Josar/RIOT,smlng/RIOT,OTAkeys/RIOT,yogo1212/RIOT,kaspar030/RIOT,ks156/RIOT,roberthartung/RIOT,authmillenon/RIOT,yogo1212/RIOT,aeneby/RIOT,yogo1212/RIOT,toonst/RIOT,avmelnikoff/RIOT,LudwigOrtmann/RIOT,neiljay/RIOT,ks156/RIOT,rfuentess/RIOT,BytesGalore/RIOT,neiljay/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,miri64/RIOT,A-Paul/RIOT,jasonatran/RIOT,rfuentess/RIOT,cladmi/RIOT,cladmi/RIOT,Josar/RIOT,BytesGalore/RIOT,neiljay/RIOT,rfuentess/RIOT,gebart/RIOT,yogo1212/RIOT,yogo1212/RIOT,immesys/RiSyn,kYc0o/RIOT,mfrey/RIOT,mtausig/RIOT,x3ro/RIOT,miri64/RIOT,authmillenon/RIOT,x3ro/RIOT,kbumsik/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,basilfx/RIOT,adrianghc/RIOT,BytesGalore/RIOT,ant9000/RIOT,toonst/RIOT,authmillenon/RIOT,ant9000/RIOT,A-Paul/RIOT,A-Paul/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,biboc/RIOT,kYc0o/RIOT,gebart/RIOT,ant9000/RIOT,basilfx/RIOT,basilfx/RIOT,smlng/RIOT,ant9000/RIOT,immesys/RiSyn,avmelnikoff/RIOT,A-Paul/RIOT,RIOT-OS/RIOT,toonst/RIOT,lazytech-org/RIOT,LudwigOrtmann/RIOT,kbumsik/RIOT,neiljay/RIOT,yogo1212/RIOT,mtausig/RIOT,immesys/RiSyn,immesys/RiSyn,LudwigOrtmann/RIOT,adrianghc/RIOT,OlegHahm/RIOT