net: hns3: set the cmdq out_vld bit to 0 after used

Driver check the out_vld bit when get a new cmdq BD, if the bit is 1,
the BD is valid. driver Should set the bit 0 after used and hw will
set the bit 1 if get a valid BD.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>