ethtool: cosmetic: Use ethtool ethtool_cmd_speed API

This updates the network drivers so that they don't access the
ethtool_cmd::speed field directly, but use ethtool_cmd_speed()
instead.

For most of the drivers, these changes are purely cosmetic and don't
fix any problem, such as for those 1GbE/10GbE drivers that indirectly
call their own ethtool get_settings()/mii_ethtool_gset(). The changes
are meant to enforce code consistency and provide robustness with
future larger throughputs, at the expense of a few CPU cycles for each
ethtool operation.

All drivers compiled with make allyesconfig ion x86_64 have been
updated.

Tested: make allyesconfig on x86_64 + e1000e/bnx2x work
Signed-off-by: David Decotigny <decot@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bcm63xx_enet.c b/drivers/net/bcm63xx_enet.c
index e68ffe6..f1573d4 100644
--- a/drivers/net/bcm63xx_enet.c
+++ b/drivers/net/bcm63xx_enet.c
@@ -1346,7 +1346,8 @@
 		return phy_ethtool_gset(priv->phydev, cmd);
 	} else {
 		cmd->autoneg = 0;
-		cmd->speed = (priv->force_speed_100) ? SPEED_100 : SPEED_10;
+		ethtool_cmd_speed_set(cmd, ((priv->force_speed_100)
+					    ? SPEED_100 : SPEED_10));
 		cmd->duplex = (priv->force_duplex_full) ?
 			DUPLEX_FULL : DUPLEX_HALF;
 		cmd->supported = ADVERTISED_10baseT_Half  |