net: fill in MODULE_DESCRIPTION()s for litex

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to the LiteX Liteeth Ethernet device.
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Gabriel Somlo <gsomlo@gmail.com>
Link: https://lore.kernel.org/r/20240123190332.677489-10-leitao@debian.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/litex/litex_liteeth.c

@@ -318,4 +318,5 @@ static struct platform_driver liteeth_driver = {
 module_platform_driver(liteeth_driver);
 
 MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>");
+MODULE_DESCRIPTION("LiteX Liteeth Ethernet driver");
 MODULE_LICENSE("GPL");