net: bridge: Introduce BROPT_FDB_LOCAL_VLAN_0

net: bridge: Introduce BROPT_FDB_LOCAL_VLAN_0

The following patches will gradually introduce the ability of the bridge
to look up local FDB entries on VLAN 0 instead of using the VLAN indicated
by a packet.

In this patch, just introduce the option itself, with which the feature
will be linked.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/ab85e33ef41ed19a3deaef0ff7da26830da30642.1757004393.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>