net/mlx5: Add IFC bits for PCIe Congestion Event object

Add definitions for the PCIe Congestion Event object
and the relevant FW command structures.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Link: https://patch.msgid.link/20250619113721.60201-3-mbloch@nvidia.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>