qmi-network: support IP-TYPE configuration
Some modems, probably in combination with some carriers (in my experience, Vodafone + FN980 for example) do not allow IPV4V6 configuration while calling wds-start-network.
qmi-network does not configure ip-type when calling wds-start-network, resulting (in this case) in the error:
error: couldn't start network: QMI protocol error (14): 'CallFailed' call end reason (1): generic-unspecified verbose call end reason (6,50): [3gpp] ipv4-only-allowed
This patch is intended to add support to IP-TYPE configuration value in qmi-network and qmi-network.conf to fix it.