net/mlx5e: CT: Update connection tracking steering entries

Previously, replacing a connection tracking steering entry was done by
adding a new rule (with the same tag but possibly different mod hdr
actions/labels) then removing the old rule.

This approach doesn't work in hardware steering because two steering
entries with the same tag cannot coexist in a hardware steering table.

This commit prepares for that by adding a new ct_rule_update operation on
the ct_fs_ops struct which is used instead of add+delete.
Implementations for both dmfs (firmware steering) and smfs (software
steering) are provided, which simply add the new rule and delete the old
one.

Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20240808055927.2059700-12-tariqt@nvidia.com


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