Quite some network drivers call netif_carrier_off() in their probe() function.
So I'm wondering whether we can/should add a
set_bit(__LINK_STATE_NOCARRIER, &dev->state)
to register_netdevice() and remove all these netif_carrier_off() calls.
Question is whether there's any scenario where a driver would depend on bit
__LINK_STATE_NOCARRIER being cleared after registering the netdevice
or where we want to preserve the state of this bit.