i40e: count drops in netstat interface

The i40e rx_dropped counter was not showing up in netstat -i.
Add the right counter to be updated with the stats.

Change-ID: I4dd552e9995836099184f9d9a08e90edb591155f
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -474,6 +474,7 @@ static struct rtnl_link_stats64 *i40e_get_netdev_stats_struct(
 	stats->tx_errors	= vsi_stats->tx_errors;
 	stats->tx_dropped	= vsi_stats->tx_dropped;
 	stats->rx_errors	= vsi_stats->rx_errors;
+	stats->rx_dropped	= vsi_stats->rx_dropped;
 	stats->rx_crc_errors	= vsi_stats->rx_crc_errors;
 	stats->rx_length_errors	= vsi_stats->rx_length_errors;