realtek: dsa: move port_ignore constant to config

realtek: dsa: move port_ignore constant to config

Device specific constants belong into the config structure.
No need to initialize them manually during probing within a
family_id switch statement. Although there are lots of constants
that need to be converted start with port_ignore as a simple one.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/22026
Signed-off-by: Robert Marko <robimarko@gmail.com>