net/mlx5: DR, Remove unneeded vlan check from L2 builder

When we create a matcher we check that all fields are consumed.
There is no need for this specific check. This keeps the STE
builder functions simple and clean.

Signed-off-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>