mlxsw: spectrum_buffers: Add ability to veto pool's configuration
Subsequent patches are going to need to veto changes in certain pools'
size and / or threshold type (mode).
Add two fields to the pool's struct that indicate if either of these
attributes is allowed to change and enforce that.
Signed-off-by: Ido Schimmel <idosch@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Petr Machata <petrm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>