net/mlx5: Restore missing trace event when enabling vport QoS

Restore the `trace_mlx5_esw_vport_qos_create` event when creating
the vport scheduling element. This trace event was lost during
refactoring.

Fixes: be034bab ("net/mlx5: Make vport QoS enablement more flexible for future extensions")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250225072608.526866-3-tariqt@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>