The CPU port reports the MAC counters of a MAC it does not have, all
zero, and none of its queue counters. Report its unicast and multicast
queue counters instead, as for the user ports.
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de>
Link: https://github.com/openwrt/openwrt/pull/25700
Signed-off-by: Robert Marko <robimarko@gmail.com>