net/hns3: fix DCB configuration

net/hns3: fix DCB configuration

Currently, the DCB configuration takes effect in the dev_start stage, and
the mapping between TCs and queues are also updated in this stage.
However, the DCB configuration is delivered in the dev_configure stage.

If the configuration fails, it should be intercepted in this stage. If
the configuration succeeds, the user should be able to obtain the
corresponding updated information, such as the mapping between TCs and
queues. So this patch moves DCB configuration to dev_configure.

Fixes: 62e3ccc2b94c ("net/hns3: support flow control")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>