boards/nucleo-l1: add configuration for extra UARTs
boards/nucleo-l1: add configuration for extra UARTs

A-Paul/RIOT,jbeyerstedt/RIOT-OTA-update,rfuentess/RIOT,toonst/RIOT,Hyungsin/RIOT-OS,kaleb-himes/RIOT,jasonatran/RIOT,TobiasFredersdorf/RIOT,neumodisch/RIOT,authmillenon/RIOT,adjih/RIOT,rfuentess/RIOT,jasonatran/RIOT,ant9000/RIOT,miri64/RIOT,Ell-i/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,cladmi/RIOT,kaspar030/RIOT,adjih/RIOT,dailab/RIOT,jfischer-phytec-iot/RIOT,adrianghc/RIOT,LudwigOrtmann/RIOT,adjih/RIOT,beurdouche/RIOT,ant9000/RIOT,josephnoir/RIOT,plushvoxel/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,mfrey/RIOT,aeneby/RIOT,Hyungsin/RIOT-OS,foss-for-synopsys-dwc-arc-processors/RIOT,immesys/RiSyn,gautric/RIOT,cladmi/RIOT,thomaseichinger/RIOT,miri64/RIOT,cladmi/RIOT,gautric/RIOT,toonst/RIOT,x3ro/RIOT,miri64/RIOT,biboc/RIOT,rfuentess/RIOT,ks156/RIOT,A-Paul/RIOT,adjih/RIOT,dailab/RIOT,kaspar030/RIOT,LudwigOrtmann/RIOT,cladmi/RIOT,aeneby/RIOT,lazytech-org/RIOT,x3ro/RIOT,ant9000/RIOT,smlng/RIOT,plushvoxel/RIOT,thomaseichinger/RIOT,roberthartung/RIOT,authmillenon/RIOT,roberthartung/RIOT,beurdouche/RIOT,Ell-i/RIOT,LudwigKnuepfer/RIOT,toonst/RIOT,mfrey/RIOT,hamilton-mote/RIOT-OS,Ell-i/RIOT,neumodisch/RIOT,RIOT-OS/RIOT,kbumsik/RIOT,x3ro/RIOT,kaleb-himes/RIOT,roberthartung/RIOT,beurdouche/RIOT,LudwigOrtmann/RIOT,kerneltask/RIOT,avmelnikoff/RIOT,Josar/RIOT,gautric/RIOT,lazytech-org/RIOT,plushvoxel/RIOT,RIOT-OS/RIOT,Hyungsin/RIOT-OS,neumodisch/RIOT,OlegHahm/RIOT,smlng/RIOT,dkm/RIOT,jbeyerstedt/RIOT-OTA-update,ant9000/RIOT,syin2/RIOT,smlng/RIOT,Josar/RIOT,LudwigKnuepfer/RIOT,mtausig/RIOT,OTAkeys/RIOT,dkm/RIOT,lazytech-org/RIOT,immesys/RiSyn,OTAkeys/RIOT,aeneby/RIOT,neumodisch/RIOT,kaspar030/RIOT,authmillenon/RIOT,josephnoir/RIOT,kYc0o/RIOT,ks156/RIOT,kbumsik/RIOT,jbeyerstedt/RIOT-OTA-update,dkm/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,yogo1212/RIOT,smlng/RIOT,smlng/RIOT,basilfx/RIOT,LudwigOrtmann/RIOT,authmillenon/RIOT,jbeyerstedt/RIOT-OTA-update,kerneltask/RIOT,neumodisch/RIOT,OlegHahm/RIOT,neiljay/RIOT,jbeyerstedt/RIOT-OTA-update,x3ro/RIOT,dailab/RIOT,gebart/RIOT,biboc/RIOT,kbumsik/RIOT,hamilton-mote/RIOT-OS,adrianghc/RIOT,TobiasFredersdorf/RIOT,dailab/RIOT,mfrey/RIOT,hamilton-mote/RIOT-OS,ks156/RIOT,kbumsik/RIOT,miri64/RIOT,yogo1212/RIOT,avmelnikoff/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,yogo1212/RIOT,immesys/RiSyn,ks156/RIOT,mfrey/RIOT,adrianghc/RIOT,syin2/RIOT,kYc0o/RIOT,mfrey/RIOT,adrianghc/RIOT,TobiasFredersdorf/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,immesys/RiSyn,gebart/RIOT,hamilton-mote/RIOT-OS,mtausig/RIOT,Ell-i/RIOT,aeneby/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,TobiasFredersdorf/RIOT,adjih/RIOT,BytesGalore/RIOT,yogo1212/RIOT,roberthartung/RIOT,avmelnikoff/RIOT,kaleb-himes/RIOT,syin2/RIOT,toonst/RIOT,neumodisch/RIOT,basilfx/RIOT,jfischer-phytec-iot/RIOT,kerneltask/RIOT,thomaseichinger/RIOT,BytesGalore/RIOT,LudwigKnuepfer/RIOT,lazytech-org/RIOT,syin2/RIOT,Hyungsin/RIOT-OS,biboc/RIOT,gebart/RIOT,LudwigKnuepfer/RIOT,OlegHahm/RIOT,biboc/RIOT,authmillenon/RIOT,mtausig/RIOT,Josar/RIOT,avmelnikoff/RIOT,OlegHahm/RIOT,x3ro/RIOT,adrianghc/RIOT,BytesGalore/RIOT,ks156/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,aeneby/RIOT,kbumsik/RIOT,basilfx/RIOT,kYc0o/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,gebart/RIOT,gautric/RIOT,plushvoxel/RIOT,kaspar030/RIOT,jasonatran/RIOT,plushvoxel/RIOT,miri64/RIOT,lazytech-org/RIOT,dkm/RIOT,gautric/RIOT,LudwigKnuepfer/RIOT,syin2/RIOT,hamilton-mote/RIOT-OS,yogo1212/RIOT,jasonatran/RIOT,kYc0o/RIOT,kYc0o/RIOT,jfischer-phytec-iot/RIOT,authmillenon/RIOT,thomaseichinger/RIOT,biboc/RIOT,rfuentess/RIOT,BytesGalore/RIOT,kerneltask/RIOT,Ell-i/RIOT,josephnoir/RIOT,TobiasFredersdorf/RIOT,jasonatran/RIOT,LudwigOrtmann/RIOT,beurdouche/RIOT,immesys/RiSyn,jfischer-phytec-iot/RIOT,dkm/RIOT,neiljay/RIOT,rfuentess/RIOT,Josar/RIOT,kerneltask/RIOT,OlegHahm/RIOT,kaleb-himes/RIOT,A-Paul/RIOT,roberthartung/RIOT,yogo1212/RIOT,kaleb-himes/RIOT,Hyungsin/RIOT-OS,mtausig/RIOT,immesys/RiSyn,mtausig/RIOT,A-Paul/RIOT,basilfx/RIOT,ant9000/RIOT,Josar/RIOT,thomaseichinger/RIOT,jfischer-phytec-iot/RIOT,neiljay/RIOT,neiljay/RIOT,beurdouche/RIOT,OTAkeys/RIOT,toonst/RIOT,josephnoir/RIOT,gebart/RIOT,cladmi/RIOT,dailab/RIOT,avmelnikoff/RIOT,A-Paul/RIOT,basilfx/RIOT,neiljay/RIOT,kaspar030/RIOT