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

Since the UART module takes control of RX and TX pins, there
is no need to configure the pins.

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

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