iouring: remove IORING_URING_CMD_POLLED

No more users of this flag.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20231130215309.2923568-4-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/io_uring.h

@@ -28,7 +28,6 @@ enum io_uring_cmd_flags {
 
 /* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */
 #define IORING_URING_CMD_CANCELABLE	(1U << 30)
-#define IORING_URING_CMD_POLLED		(1U << 31)
 
 struct io_uring_cmd {
 	struct file	*file;