net: report csum_complete via qstats

Commit 13c7c941 ("netdev: add qstat for csum complete") reserved
the entry for csum complete in the qstats uAPI. Start reporting this
value now that we have a driver which needs it.

Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20250211181356.580800-2-kuba@kernel.org


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