net/mlx5: update flow functions
net/mlx5: update flow functions

Update flow creation/destroy functions for future reuse.
List operations can be skipped inside functions and done
separately out of flow creation.

Signed-off-by: Yongseok Koh <76b37c91816d73ef9cf709e3e83a68f2d162f1e2@mellanox.com>
Signed-off-by: Viacheslav Ovsiienko <5b8db9bb93a9a9aefc8828f79604d1fe963a53dd@mellanox.com>
Acked-by: Matan Azrad <6969f5f553ad7652679a585a85d7321babc90464@mellanox.com>

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