net_sched: act_vlan: use RCU in tcf_vlan_dump()

Also storing tcf_action into struct tcf_vlan_params
makes sure there is no discrepancy in tcf_vlan_act().

No longer block BH in tcf_vlan_init() when acquiring tcf_lock.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250827125349.3505302-3-edumazet@google.com


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