mlx4: Fix infiniband Kconfig dependencies.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/mlx4/Kconfig

 config MLX4_INFINIBAND
 	tristate "Mellanox ConnectX HCA support"
-	depends on NETDEVICES && NETDEV_10000 && PCI
+	depends on NETDEVICES && ETHERNET && PCI
+	select NET_VENDOR_MELLANOX
 	select MLX4_CORE
 	---help---
 	  This driver provides low-level InfiniBand support for