au1000-eth: implement set/get_msglevel

{set,get}_msglevel is required to use netif_{err,dbg} macros.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/au1000_eth.h b/drivers/net/au1000_eth.h
index 344c600..d06ec00 100644
--- a/drivers/net/au1000_eth.h
+++ b/drivers/net/au1000_eth.h
@@ -125,4 +125,6 @@
 	dma_addr_t dma_addr;      /* dma address of rx/tx buffers       */
 
 	spinlock_t lock;       /* Serialise access to device */
+
+	u32 msg_enable;
 };