huawei: use AT^DHCP response if available for NDISDUP-capable devices

For non-QMI/non-MBIM Huawei devices that use HiSense chipsets,
the recommended way to create the connection is to use NDISDUP
and either DHCP on the net interface, or the ^DHCP command.
There are some reports of devices that connect successfully, but
don't respond to DHCP requests on the interface.  Try to get
IP addressing info from the device via ^DHCP and fall back to
telling clients to use actual DHCP if that fails.

https://bugzilla.redhat.com/show_bug.cgi?id=1254886

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