net/mlx5e: Make PCIe congestion event thresholds configurable

net/mlx5e: Make PCIe congestion event thresholds configurable

Add devlink driverinit parameters for configuring the thresholds for
PCIe congestion events. These parameters are registered only when the
firmware supports this feature.

Update the mlx5 devlink docs as well on these new params.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1757237976-531416-2-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>