net/mlx5: Add migration commands definitions

Update mlx5 command list and error return function to handle migration
commands.

Link: https://lore.kernel.org/all/20220224142024.147653-8-yishaih@nvidia.com


Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>