net: fill in MODULE_DESCRIPTION()s for encx24j600

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to the Microchip ENCX24J600 helpers driver.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/encx24j600-regmap.c

@@ -513,4 +513,5 @@ int devm_regmap_init_encx24j600(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_regmap_init_encx24j600);
 
+MODULE_DESCRIPTION("Microchip ENCX24J600 helpers");
 MODULE_LICENSE("GPL");