mlxsw: spectrum_matchall: Pass mall_entry as arg to mlxsw_sp_mall_port_mirror_add()

In the preparation for future changes, have the
mlxsw_sp_mall_port_mirror_add() function to accept mall_entry including
the "to_dev" originally obtained from act pointer.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>