io_uring: remove ring quiesce for io_uring_register

None of the opcodes in io_uring_register use ring quiesce anymore. Hence
io_register_op_must_quiesce always returns false and io_ctx_quiesce is
never called.

Signed-off-by: Usama Arif <usama.arif@bytedance.com>
Link: https://lore.kernel.org/r/20220204145117.1186568-6-usama.arif@bytedance.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>