net: qmi_wwan: add Telit LE920 newer firmware support

Newer firmware use a new pid and a different interface.

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>