net/mlx5: limit LRO size to maximum Rx packet

net/mlx5: limit LRO size to maximum Rx packet

The field max_rx_pkt_len in Rx configuration indicates the maximum size
for Rx packet to be received.

There was no any field to indicate the maximum size of LRO packet to be
received by the application.

Assuming the user configures max_rx_pkt_len as the maximum LRO packet
length when LRO is configured on the port, the PMD limits the maximum
LRO packet size received from HW to be max_rx_pkt_len.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>