Revert "Merge pull request #9699 from miri64/nrf5x_common/fix/gpio-unused-function"
Revert "Merge pull request #9699 from miri64/nrf5x_common/fix/gpio-unused-function"

This reverts commit 2d10390b56b11ec0193ae2d1c5bda1b8ee5c45f2, reversing
changes made to 2f480efb60e6c7934b446a38c397b04af7fe35de.

ant9000/RIOT,mtausig/RIOT,authmillenon/RIOT,gebart/RIOT,RIOT-OS/RIOT,miri64/RIOT,josephnoir/RIOT,smlng/RIOT,A-Paul/RIOT,miri64/RIOT,authmillenon/RIOT,cladmi/RIOT,mtausig/RIOT,mtausig/RIOT,mfrey/RIOT,smlng/RIOT,toonst/RIOT,BytesGalore/RIOT,basilfx/RIOT,cladmi/RIOT,lazytech-org/RIOT,miri64/RIOT,josephnoir/RIOT,yogo1212/RIOT,A-Paul/RIOT,authmillenon/RIOT,gebart/RIOT,OlegHahm/RIOT,kYc0o/RIOT,rfuentess/RIOT,aeneby/RIOT,mfrey/RIOT,BytesGalore/RIOT,biboc/RIOT,cladmi/RIOT,ant9000/RIOT,BytesGalore/RIOT,jasonatran/RIOT,x3ro/RIOT,OlegHahm/RIOT,basilfx/RIOT,yogo1212/RIOT,biboc/RIOT,miri64/RIOT,aeneby/RIOT,yogo1212/RIOT,yogo1212/RIOT,OlegHahm/RIOT,authmillenon/RIOT,kYc0o/RIOT,biboc/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,ant9000/RIOT,gebart/RIOT,mfrey/RIOT,A-Paul/RIOT,jasonatran/RIOT,OTAkeys/RIOT,mtausig/RIOT,authmillenon/RIOT,ant9000/RIOT,ant9000/RIOT,kYc0o/RIOT,toonst/RIOT,rfuentess/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,x3ro/RIOT,RIOT-OS/RIOT,cladmi/RIOT,toonst/RIOT,kaspar030/RIOT,x3ro/RIOT,toonst/RIOT,mfrey/RIOT,yogo1212/RIOT,gebart/RIOT,miri64/RIOT,BytesGalore/RIOT,jasonatran/RIOT,rfuentess/RIOT,biboc/RIOT,kaspar030/RIOT,OTAkeys/RIOT,josephnoir/RIOT,lazytech-org/RIOT,toonst/RIOT,aeneby/RIOT,biboc/RIOT,gebart/RIOT,jasonatran/RIOT,josephnoir/RIOT,authmillenon/RIOT,basilfx/RIOT,kaspar030/RIOT,rfuentess/RIOT,A-Paul/RIOT,rfuentess/RIOT,BytesGalore/RIOT,kYc0o/RIOT,mtausig/RIOT,RIOT-OS/RIOT,cladmi/RIOT,A-Paul/RIOT,smlng/RIOT,smlng/RIOT,aeneby/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,kaspar030/RIOT,basilfx/RIOT,basilfx/RIOT,x3ro/RIOT,OlegHahm/RIOT,mfrey/RIOT,smlng/RIOT,x3ro/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,kYc0o/RIOT,lazytech-org/RIOT,yogo1212/RIOT,OTAkeys/RIOT,aeneby/RIOT,lazytech-org/RIOT