net: phy: cortina: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE

This change resolves a new compile-time warning
when built as a loadable module:

WARNING: modpost: missing MODULE_LICENSE() in drivers/net/phy/cortina.o
see include/linux/module.h for more information

This adds the license as "GPL", which matches the header of the file.

MODULE_DESCRIPTION and MODULE_AUTHOR are also added.
Signed-off-by: NJesse Chan <jc@linux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/cortina.c

@@ -116,3 +116,7 @@ static struct mdio_device_id __maybe_unused cortina_tbl[] = {
 };
 
 MODULE_DEVICE_TABLE(mdio, cortina_tbl);
+
+MODULE_DESCRIPTION("Cortina EDC CDR 10G Ethernet PHY driver");
+MODULE_AUTHOR("NXP");
+MODULE_LICENSE("GPL");