device: ensure DHCP is restarted every time the link goes up

Currently we call nm_device_update_dynamic_ip_setup() in
carrier_changed() every time the carrier goes up again and the device
is activating, to kick a restart of DHCP.

Since we process link events in a idle handler, it can happen that the
handler is called only once for different events; in particular
device_link_changed() might be called once for a link-down/link-up
sequence.

carrier_changed() is "level-triggered" - it cares only about the
current carrier state. nm_device_update_dynamic_ip_setup() should
instead be "edge-triggered" - invoked every time the link goes from
down to up. We have a mechanism for that in device_link_changed(), use
it.

Fixes-test: @ipv4_spurious_leftover_route

https://bugzilla.redhat.com/show_bug.cgi?id=2079406
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