net: hns3: don't change tc mqprio configuration when client is unregistered

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

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If client is unregistered, it's shouldn't change the tc mqprio
configuration, which may cause uninit ring fail.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: li yongxin <liyongxin1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>