pc-bios/s390-ccw/net: Split up net_load() into init, load and release parts

When we want to support pxelinux-style network booting later, we've got
to do several TFTP transfers - and we do not want to apply for a new IP
address via DHCP each time. So split up net_load into three parts:

1. net_init(), which initializes virtio-net, gets an IP address via DHCP
   and prints out the related information.

2. The tftp_load call is now moved directly into the main() function

3. A new net_release() function which should tear down the network stack
   before we are done in the firmware.

This will make it easier to extend the code in the next patches.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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