port-qmi: apply master MTU handling to all multiplexing types in qmi_wwan
If using rmnet and IP passthrough setting in qmi_wwan, also configure the master interface with an MTU equal to the maximum data aggregation size.
Fixes #367 (closed)
If using rmnet and IP passthrough setting in qmi_wwan, also configure the master interface with an MTU equal to the maximum data aggregation size.
Fixes #367 (closed)