nvme: export fast_io_fail_tmo to sysfs

mainline inclusion
from mainline-v5.13-rc1
commit 09fbed63
category: bugfix
bugzilla: NA
CVE: NA
Link: https://gitee.com/openeuler/kernel/issues/I4JFPM?from=project-issue



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Commit 8c4dfea9 ("nvme-fabrics: reject I/O to offline device")
introduced fast_io_fail_tmo but didn't export the value to sysfs. The
value can be set during the 'nvme connect'. Export the timeout value
to user space via sysfs to allow runtime configuration.

Cc: Victor Gladkov <Victor.Gladkov@kioxia.com>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Himanshu Madhani <himanshu.madhaani@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

conflicts:
drivers/nvme/host/core.c
[adjust context]

Signed-off-by: jiangtao <jiangtao62@huawei.com>
Reviewed-by: chengjike <chengjike.cheng@huawei.com>
Reviewed-by: Ao Sun <sunao.sun@huawei.com>
Reviewed-by: Zhenwei Yang <yangzhenwei@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>