net/mlx5e: Support PSP offload functionality

Add PSP offload related structs, layouts, and enumerations. Implement
.set_config and .rx_spi_alloc PSP device operations. Driver does not
need to make use of the .set_config operation. Stub .assoc_add and
.assoc_del PSP operations.

Introduce the MLX5_EN_PSP configuration option for enabling PSP offload
support on mlx5 devices.

Signed-off-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
Link: https://patch.msgid.link/20250917000954.859376-12-daniel.zahka@gmail.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>