net/mlx5e: TC, Remove redundant action stack var

Remove the action stack var from parse tc fdb actions
and prase tc nic actions, use the flow attr action var directly.

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