Merge branch 'net-dsa-b53-minor-fdb-related-fixes'

Merge branch 'net-dsa-b53-minor-fdb-related-fixes'

Jonas Gorski says:

====================
net: dsa: b53: minor fdb related fixes

While investigating and fixing/implenting proper ARL support for
bcm63xx, I encountered multiple minor issues in the current ARL
implementation:

* The ARL multicast support was not properly enabled for older chips,
  and instead a potentially reserved bit was toggled.
* While traversing the ARL table, "Search done" triggered one final
  entry which will be invalid for 4 ARL bin chips, and failed to stop
  the search on chips with only one result register.
* For chips where we have only one result register, we only traversed at
  most half the maximum entries.

I also had a fix for IVL_SVL_SELECT which is only valid for some chips,
but since this would only have an effect for !vlan_enabled, and we
always have that enabled, it isn't really worth fixing (and rather drop
the !vlan_enabled paths).
====================

Link: https://patch.msgid.link/20251102100758.28352-1-jonas.gorski@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>