loop: don't abuse BLK_DEF_MAX_SECTORS

BLK_DEF_MAX_SECTORS despite the confusing name is the default cap for
the max_sectors limits.  Don't use it to initialize max_hw_setors, which
is a hardware / driver capacility.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20231227092305.279567-4-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/loop.c

@@ -2036,7 +2036,8 @@ static int loop_add(int i)
 	}
 	lo->lo_queue = lo->lo_disk->queue;
 
-	blk_queue_max_hw_sectors(lo->lo_queue, BLK_DEF_MAX_SECTORS);
+	/* random number picked from the history block max_sectors cap */
+	blk_queue_max_hw_sectors(lo->lo_queue, 2560u);
 
 	/*
 	 * By default, we do buffer IO, so it doesn't make sense to enable