[NIU]: Add Sun Neptune ethernet driver.

With cleanup suggestions and bugs spotted by Stephen Hemminger,
Ingo Oeser, Matheos Worku, and Oliver Hartkopp.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index eb5c655..d2e0f35 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -241,3 +241,4 @@
 obj-$(CONFIG_FS_ENET) += fs_enet/
 
 obj-$(CONFIG_NETXEN_NIC) += netxen/
+obj-$(CONFIG_NIU) += niu.o