net/mlx5: LAG, add MPESW over SD LAG support

net/mlx5: LAG, add MPESW over SD LAG support

Enable MPESW LAG creation over SD LAG members, forming a composite LAG
hierarchy. This allows bonding multiple SD groups together under a
single MPESW configuration with shared FDB.

When enabling composite MPESW, the individual SD LAG shared FDB
configurations are temporarily torn down and recreated when the
composite LAG is disabled.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260612113904.537595-13-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>