Revert "pidfd: prevent creation of pidfds for kthreads"

commit 232590ea7fc125986a526e03081b98e5783f70d2 upstream.

This reverts commit 3b5bbe798b2451820e74243b738268f51901e7d0.

Eric reported that systemd-shutdown gets broken by blocking the creating
of pidfds for kthreads as older versions seems to rely on being able to
create a pidfd for any process in /proc.

Reported-by: Eric Biggers <ebiggers@kernel.org>
Link: https://lore.kernel.org/r/20240818035818.GA1929@sol.localdomain
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>