dpdk: disable l4 csum offload for vmxnet3
dpdk: disable l4 csum offload for vmxnet3

TCP csum offload fails although udp seems to work.

Type: fix
Fixes: fa1fb60

Signed-off-by: Florin Coras <c9715e5cdf0718c2e9b10678757dfb027875eba2@cisco.com>
Change-Id: Ie0651887b09920365806eaad776b0d13059faee8

chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp