net: ethernet: ti: ale: use define for host port in cpsw_ale_set_allmulti()

Use ALE_PORT_HOST define for host port in cpsw_ale_set_allmulti() instead
of constants.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>