net/hns3: fix queue offload capability

net/hns3: fix queue offload capability

Currently, offload capabilities are only enabled for all Rx/Tx queues in
hns3 PF/VF PMD driver, and offload capability only applied in a Rx/Tx
queue is not supported.
So this patch moves 'DEV_TX_OFFLOAD_MBUF_FAST_FREE' from
tx_queue_offload_capa to tx_offload_capa.

Fixes: 1f5ca0b460cd ("net/hns3: support some device operations")
Fixes: a5475d61fa34 ("net/hns3: support VF")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>