drop the reduced io_uring SQ/CQ memlock backport from 6.18

Dropped patches:

- "io_uring: do not charge the SQ/CQ rings to RLIMIT_MEMLOCK"
  Upstream: b59cabf9b4ac
  Queues: 6.18
  Reason: reduced backport, replaced by Jens Axboe's full 2-patch 6.18 series
          (this commit plus cde56daf4b93), which needs the complete version.
  Report: https://lore.kernel.org/stable/c042f86a-750d-4e9e-bb7b-b5c86cbb6a7e@kernel.dk/

Signed-off-by: Sasha Levin <sashal@kernel.org>