[review] dcbw/huawei-at-dhcp: use AT^DHCP response if available for NDISDUP-capable devices

[Thomas Schäfer]

Hi,

Please forget my last mail about the missing net-interface.

I have three linux-installations. I just used the one where huawei_cdc_ncm 
doesn't load. I don't know why. 

I have to solve the problem before I do contribute to further tests.

Regards,
Thomas