mlxsw: Change the RX LAG hash function from XOR to CRC

Change the RX hash function from XOR to CRC in order to have better
distribution of the traffic.

Signed-off-by: Elad Raz <eladr@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>