Now that vmxnet3 supports TCP/UDP checksum offload, let's update
the default txq flags to allow such offloads. Also fixed the tx
queue setup check to allow TCP/UDP checksum and only error out
if SCTP checksum is requested.
Fixes: f598fd063bb1 ("vmxnet3: add Tx L4 checksum offload")
Reported-by: Heng Ding <hengx.ding@intel.com>
Signed-off-by: Yong Wang <yongwang@vmware.com>