cc1352-launchpad: remove `export` from `XDEBUGGER`
cc1352-launchpad: remove `export` from `XDEBUGGER`

Signed-off-by: Jean Pierre Dudey <341388fa1817ca285e65547384a9727ce7f6d39a@hotmail.com>

OTAkeys/RIOT,toonst/RIOT,kaspar030/RIOT,OlegHahm/RIOT,basilfx/RIOT,OlegHahm/RIOT,toonst/RIOT,x3ro/RIOT,jasonatran/RIOT,x3ro/RIOT,yogo1212/RIOT,yogo1212/RIOT,smlng/RIOT,toonst/RIOT,miri64/RIOT,miri64/RIOT,jasonatran/RIOT,ant9000/RIOT,jasonatran/RIOT,authmillenon/RIOT,OlegHahm/RIOT,x3ro/RIOT,basilfx/RIOT,yogo1212/RIOT,kYc0o/RIOT,basilfx/RIOT,RIOT-OS/RIOT,smlng/RIOT,kaspar030/RIOT,kYc0o/RIOT,jasonatran/RIOT,x3ro/RIOT,basilfx/RIOT,miri64/RIOT,OTAkeys/RIOT,smlng/RIOT,kYc0o/RIOT,yogo1212/RIOT,toonst/RIOT,basilfx/RIOT,ant9000/RIOT,jasonatran/RIOT,miri64/RIOT,OTAkeys/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,authmillenon/RIOT,OTAkeys/RIOT,smlng/RIOT,authmillenon/RIOT,kaspar030/RIOT,kYc0o/RIOT,ant9000/RIOT,kYc0o/RIOT,yogo1212/RIOT,authmillenon/RIOT,OTAkeys/RIOT,x3ro/RIOT,authmillenon/RIOT,kaspar030/RIOT,ant9000/RIOT,kaspar030/RIOT,toonst/RIOT,miri64/RIOT,ant9000/RIOT,smlng/RIOT,RIOT-OS/RIOT