From: Martin Schwidefsky <schwidefsky@de.ibm.com>

network driver fixes:
 - Use SET_NETDEV_DEV to create the link from the network device to the
   physical device. Remove link from physical to network device.
 - Remove some unnecessary casts in netiucv.
 - Add missing strings to dev_stat_names & dev_event_names.
 - Add missing preempt_disable/preempt_enable pairs in iucv.
 - Allow to change the peer username in netiucv.