qmi: always use DHCP for IPv4 configuration instead of STATICdcbw/qmi-always-dhcp

Some newer modems (Huawei E1750, Sierra 73xx) provide what looks like
legitimate static IPv4 configuration through the WDSGetCurrentSettings
call, but when configured the interface does not pass traffic.  Running
DHCP on the same interface provides a slightly different IPv4
configuration but does allow traffic to pass.

Since QMI was switched to static originally for consistency with IPv6
and for speed of IP configuration (since DHCP takes a bit of time), but
not for any known problems with modems, let's switch back to DHCP until
we have time to figure out what's actually going on.

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