nvme: fix nvme_stop_queues cost long time error

driver inclusion
category: bugfix
bugzilla: NA
Link: https://gitee.com/openeuler/kernel/issues/I1WGZE



--------------------------------

It will cost a lot of time when synchronize_rcu() is called for every
namspace in nvme_stop_queues().

Reviewed-by: Chao Leng <lengchao@huawei.com>
Reviewed-by: Jike Cheng <chengjike.cheng@huawei.com>
Signed-off-by: Di Wang <wangdi44@huawei.com>
Signed-off-by: Lijie <lijie34@huawei.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>