net/mlx5e: Remove redundant code for handling vlan actions

Remove unused code which was used only with deprecated HW
which didn't support vlan actions.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>