net: nps_enet: Fix module autoload

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/ethernet/ezchip/nps_enet.ko | grep alias
$

After this patch:

$ modinfo drivers/net/ethernet/ezchip/nps_enet.ko | grep alias
alias: of:N*T*Cezchip,nps-mgt-enetC*
alias: of:N*T*Cezchip,nps-mgt-enet

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/ezchip/nps_enet.c

···
 	{ .compatible = "ezchip,nps-mgt-enet" },
 	{ /* Sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, nps_enet_dt_ids);
 
 static struct platform_driver nps_enet_driver = {
 	.probe = nps_enet_probe,