net: dsa: rename switch EEE ops

To avoid confusion with the PHY EEE settings, rename the .set_eee and
.get_eee ops to respectively .set_mac_eee and .get_mac_eee.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>