net/hns3: fix VF RSS TC mode entry

net/hns3: fix VF RSS TC mode entry

For packets with VLAN priorities destined for the VF, hardware still
assign Rx queue based on the Up-to-TC mapping PF configured. But VF has
only one TC. If other TC don't enable, it causes that the priority
packets that aren't destined for TC0 aren't received by RSS hash but is
destined for queue 0. So driver has to enable the unused TC by using TC0
queue mapping configuration.

Fixes: c37ca66f2b27 ("net/hns3: support RSS")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Acked-by: Min Hu (Connor) <humin29@huawei.com>