net/mlx5: E-switch, Allow to add vports to rate groups

net/mlx5: E-switch, Allow to add vports to rate groups

Implement eswitch API that allows updating rate groups. If group
pointer is NULL, then move the vport to internal unlimited group zero.

Implement devlink_ops->rate_parent_node_set() callback in the terms of
the new eswitch group update API.

Enable QoS for all group's elements if a group has allocated BW share.

Co-developed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Huy Nguyen <huyn@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>