Revert "proc: don't allow async path resolution of /proc/self components"

stable inclusion
from stable-v5.10.162
commit b76c5373f084c802964e751efb825934a9bbbbec
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7P7OH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b76c5373f084c802964e751efb825934a9bbbbec



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[ Upstream commit 9e8d9e82 ]

This reverts commit 8d4c3e76.

No longer needed, as the io-wq worker threads have the right identity.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>
(cherry picked from commit 87aab0fc)