ne2k: convert to net_device_ops

Convert driver to new net_device_ops. Compile tested only.
This required some additional work to export common code ei_XXX.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/8390.h
Simple merge

diff --cc drivers/net/lib8390.c
Simple merge

diff --cc drivers/net/ne2k-pci.c
Simple merge