net: dsa: netc: add bridge mode support

Wire up the port_bridge_join, port_bridge_leave and port_vlan_filtering
DSA callbacks to support both VLAN-unaware and VLAN-aware bridge modes.

For VLAN-unaware bridges, each bridge instance is assigned a dedicated
internal PVID via NETC_VLAN_UNAWARE_PVID(bridge.num), counting down
from VID 4095. A VFT entry is created for this PVID with hardware MAC
learning and flood-on-miss forwarding enabled. The CPU port is included
as a VFT member so frames can reach the host. The reserved VID range is
blocked in port_vlan_add to prevent user-space conflicts.

Only one VLAN-aware bridge is supported at a time; this constraint is
enforced in port_bridge_join and port_vlan_filtering. The per-port PVID
is tracked in software and written to the BPDVR register whenever VLAN
filtering is active.

When a port leaves the bridge, its dynamic FDB entries are flushed right
away in port_bridge_leave(), without waiting for the ageing cycle. When
a link down event occurs on a port, netc_mac_link_down() will also clear
the port's dynamic FDB entries via netc_port_remove_dynamic_entries().
Non-bridge ports have no dynamic FDB entries, so this call is always
safe. Additionally, .port_fast_age() callback is added to flush the
dynamic FDB entries associated to a port.

Host flood rules are removed from the ingress port filter table when a
port joins a bridge to avoid bypassing FDB lookup and MAC learning.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260611021458.2629145-9-wei.fang@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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