There already was an option for autoconfiguring IPv4 from QMI but this
was removed by commit 3b9b963e6e08 ("uqmi: always use DHCP for IPv4").
DHCP does not work on MR400 LTE module (in TL-MR6400 v4) so let's readd
support for IPv4 autoconf from QMI but this time allow to configure this
for IPv4 and IPv6 independently and keep DHCP default on IPv4.
Signed-off-by: Filip Moc <lede@moc6.cz>
9ebbb55113