net: mventa: drop mvneta_stats from mvneta_swbm_rx_frame signature

Remove mvneta_stats from mvneta_swbm_rx_frame signature since now stats
are accounted in mvneta_run_xdp routine

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>