hv_netvsc: change netvsc device default duplex to FULL

The netvsc device supports full duplex by default.
This warnings in log from bonding device which did not like
seeing UNKNOWN duplex.

Signed-off-by: Simon Xiao <sixiao@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 97d0b58..4421a6d 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -861,7 +861,7 @@
 	struct net_device_context *ndc = netdev_priv(dev);
 
 	ndc->speed = SPEED_UNKNOWN;
-	ndc->duplex = DUPLEX_UNKNOWN;
+	ndc->duplex = DUPLEX_FULL;
 }
 
 static int netvsc_get_link_ksettings(struct net_device *dev,