net/mlx5e: Always select CONFIG_PAGE_POOL_STATS

Always set PAGE_POOL_STATS in mlx5 Eth driver.
Cleanup the corresponding #ifdefs.

Page pool stats are essential to monitor and analyze RX performance.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Link: https://patch.msgid.link/1742412199-159596-4-git-send-email-tariqt@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>