devkit: Fix tutorial for location services

The GNSS module on the modem is disabled. The actual module speaks NMEA over a dedicated serial interface.
2 jobs for master in 11 minutes and 11 seconds
Status Job ID Name Coverage
  Build
passed #6952
librem5
build_html

00:10:47

 
  Deploy
passed #6953
librem5
publish

00:00:23