Revert "fs: check FMODE_LSEEK to control internal pipe splicing"

stable inclusion
from stable-v4.19.262
commit 6d43e94b8daf009694d709c5919d67067936577a
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5ZXGL


CVE: NA

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

This reverts commit fd0a6e99b61e6c08fa5cf585d54fd956f70c73a6.

Which was upstream commit 97ef77c5.

The commit is missing dependencies and breaks NFS tests, remove it for
now.

Reported-by: Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>