[dts] [PATCH]Convert dts to new Tx offload API

[Liu, Yong]

Thanks, lijuan. Applied.

On 01/16/2018 11:17 PM, Lijuan Tu wrote:
> dpdk18.02 tx offloads API changed.
> dpdk commit 28da7d752bf0("app/testpmd: remove txqflags option")
>
> As app/testpmd is now using the new Ethdev offloads API,
> and there is necessary to change DTS to align to it.
>
> Signed-off-by: Lijuan Tu<lijuanx.a.tu at intel.com>