mlxsw: spectrum_matchall: Push per-port rule add/del into separate functions

As the replace/destroy is going to be used later on per-block, push
the per-port rule addition/deletion into separate functions.

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>