Add GNSS SystemStatus component to handle debug NMEA messages
from mpss. This component handles GNSS debug info sent through
debug NMEA and then stores it in its cache and pass it to
clients per requests. Also debug NMEA is turned on by default.
Change-Id: Ia11a124ff43d27568f544a3a4742dd7a846869fe
CRs-Fixed: 1099152
