net: dwc-xlgmac: add module license

When building the driver as a module, we get a warning about the
lack of a license:

WARNING: modpost: missing MODULE_LICENSE() in drivers/net/ethernet/synopsys/dwc-xlgmac.o
see include/linux/module.h for more information

Curiously the text in the .c files only mentions GPLv2+, while the license
tag in the PCI driver contains both GPL and BSD. I picked the license text
as the more definite reference here and put a GPL tag in there.

Fixes: 65e0ace2 ("net: dwc-xlgmac: Initial driver for DesignWare Enterprise Ethernet")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/synopsys/dwc-xlgmac-common.c

@@ -25,6 +25,7 @@
 
 static int debug = -1;
 module_param(debug, int, 0644);
+MODULE_LICENSE("GPL");
 MODULE_PARM_DESC(debug, "DWC ethernet debug level (0=none,...,16=all)");
 static const u32 default_msg_level = (NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
 				      NETIF_MSG_IFUP);