shared-qmi: don't assume LOC assistance data servers is initialized once
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0x00005594f143b221 (ModemManager -mm-shared-qmi.c:6651) loc_location_get_predicted_orbits_data_source_indication_cb
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0x00007bcb785acc70 (libqmi-glib.so.5 -qmi-loc.c:16976) process_indication
0x00007bcb78520ede (libqmi-glib.so.5 -qmi-device.c:1697) process_indication_idle
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