UPSTREAM: af_unix: Remove io_uring code for GC.

commit 11498715 upstream.

Since commit 705318a9 ("io_uring/af_unix: disable sending
io_uring over sockets"), io_uring's unix socket cannot be passed
via SCM_RIGHTS, so it does not contribute to cyclic reference and
no longer be candidate for garbage collection.

Also, commit 6e5e6d27 ("io_uring: drop any code related to
SCM_RIGHTS") cleaned up SCM_RIGHTS code in io_uring.

Let's do it in AF_UNIX as well by reverting commit 0091bfc8
("io_uring/af_unix: defer registered files gc to io_uring release")
and commit 10369080 ("net: reclaim skb->scm_io_uring bit").

Bug: 404256079
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20240129190435.57228-3-kuniyu@amazon.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit c0d56c02)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I1f6093a5116b5c5918d613af1b25122f4217712f