Reapply "io_uring: drop any code related to SCM_RIGHTS"

This reverts commit 81cc178d which was a
revert of commit a3812a47 which is
commit 6e5e6d27 upstream.

It brings it back in an abi-safe way.

Bug: 338889538
Change-Id: I5e2fd45fb4d972056728fb9963a9ef9f86e9a6ca
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
(cherry picked from commit 19e119d2)
Signed-off-by: Lee Jones <joneslee@google.com>
(cherry picked from commit a2e92a89e8d33204e453ef04833f293f9ebb2635)
Signed-off-by: Lee Jones <joneslee@google.com>