Fix reporting 3GPP location info in newer QMI devices

[Aleksander Morgado]

Hey Dan,

The following two patches will fix the MCC/MNC/LAC/CID reporting in the Location interface, which was broken especially with newer QMI modems like the MC7304. Once the two patches are in place, the location info will be available as soon as the modem gets first enabled and registered:

$ mmcli -m 0 -e
$ mmcli -m 0 --location-get-3gpp

/org/freedesktop/ModemManager1/Modem/0
  -------------------------
  3GPP location   | Mobile country code: '214'
                  | Mobile network code: '1'
                  |  Location area code: '65534'
                  |             Cell ID: '72196353'

Comments?

  [PATCH 1/2] broadband-modem-qmi: LAC/CID not given in all serving system indications
  [PATCH 2/2] mm-broadband-modem: trigger registration checks only after enabling all ifaces