net/mlx5e: Remove duplicate code for user flow

Flow table and priority detection is same for IP user flows and other L4
flows. Hence, use same code for all these flow types.

Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>