net/mlx5e: Remove unused argument from parse_tc_pedit_action()

parse_attr is not used by parse_tc_pedit_action() so revmove it.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>