net/mlx5: allow LRO in regular Rx queue

net/mlx5: allow LRO in regular Rx queue

LRO support was only for MPRQ, hence mprq Rx burst was selected when
LRO was configured in the port.

The current support for MPRQ is suffering from bad memory utilization
since an external mempool is allocated by the PMD for the packets data
in addition to the user mempool, besides that, the user may get packet
data addresses which were not configured by him.

Even though MPRQ has the best performance for packet receiving in the
most cases and because of the above facts it is better to remove the
automatic MPRQ select when LRO is configured.

Move MPRQ to be selected only when the user force it by the PMD
arguments including LRO case.

Allow LRO offload using the regular RQ with the regular Rx burst
function.

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