net/mlx5: DR, moved all the SWS code into a separate directory

After adding HWS support in a separate folder, moving all the SWS
code into its own folder as well.
Now SWS and HWS implementation are located in their appropriate
folders:
 - steering/sws/
 - steering/hws/

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20241031125856.530927-3-tariqt@nvidia.com


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