drivers/mtd_spi_nor: fix chip erase
drivers/mtd_spi_nor: fix chip erase

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