net: hns3: remove now redundant logic related to HNAE3_UNKNOWN_RESET

Earlier patches have decoupled the MSI-X conveyed error handling
and recovery logic. This earlier concept code is no longer required.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>