boards: pic32-clicker: Remove useless UART pin configuration
boards: pic32-clicker: Remove useless UART pin configuration

Signed-off-by: Francois Berder <0eabc3e9da54407da074ac08d4217d54f5b94915@imgtec.com>

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