net/mlx5: remove cache term from the list utility

net/mlx5: remove cache term from the list utility

The internal mlx5 list tool is used mainly when the list objects need to
be synchronized between multiple threads.

The "cache" term is used in the internal mlx5 list API.

Next enhancements on this tool will use the "cache" term for per thread
cache management.

To prevent confusing, remove the current "cache" term from the API's
names.

Signed-off-by: Matan Azrad <matan@nvidia.com>
Acked-by: Suanming Mou <suanmingm@nvidia.com>