realtek: dts: add LGS328C port 21 definition
Port 21 definition was missed during addition of LGS328C.
Add it to the dts.
Fixes: 853d73f ("realtek: add support for Linksys LGS328C")
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21793
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit
75fd2497acb25f77528c7aa73470f303a98f8b63)
Link: https://github.com/openwrt/openwrt/pull/21900
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>