This patch adds an LTE atom for QMI modems.
This atom sets the APN that the LTE default bearer should use when
establishing its PDP context. This APN needs to be set on the 'default'
profile so the atom queries which profile is the default and resets
it before allowing the APN to be set.
Once configured, the default profile settings are used when the
modem connects to the network; for this reason, the LTE atom needs
to be instantiated in post_sim, before the modem is set online.
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