Improve GNSS parsing to ensure GGA parsing
Improve GNSS parsing to ensure GGA parsing

Since GNSS receivers can broadcast other NMEA sentences than just
GGA, we loop a finite amount of times until we find one. This
ensures that we update the platform's position ever GNSS task
tick.

AHABus/fcore,AHABus/fcore,AHABus/fcore