mlxsw: spectrum: Add periodic ACL rule activity update

Introduce periodic task for dumping the activity status for the ACL
rule TCAM entries. This is done in order to emulate last use statistics.

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