mm: remove NR_BOUNCE zone stat

The stat is always 0 now, so remove it and hardwire the user visible
output to 0.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20250505081138.3435992-8-hch@lst.de


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