net/mlx5: Add IFC bits to support RSS for IPSec offload

net/mlx5: Add IFC bits to support RSS for IPSec offload

This adds the capabilities, ipsec_next_header and inner/outer
l4_type_ext fields to support RSS for the decrypted packets.

These fields are specifically for firmware steering. HWS validation
logic is updated to correctly handle the changes, ensuring the
unsupported fields are not set.

Besides, reserved_at_c4 is fixed to reserved_at_d4 to reflect the
accurate offset within the structure.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-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/1752734895-257735-2-git-send-email-tariqt@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>