net/mlx5e: Take packet_merge params directly from the RX res struct

As packet_merge params structure is saved on the RX resources structure, there
is no need to pass it separately.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>