net: dsa: use "extack" as argument to flow_action_basic_hw_stats_check()

We already have an "extack" stack variable in
dsa_user_add_cls_matchall_police() and
dsa_user_add_cls_matchall_mirred(), there is no need to retrieve
it again from cls->common.extack.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20241023135251.1752488-4-vladimir.oltean@nxp.com


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