RTL8261N is used on some Airoha and Realtek devices. Move the driver
from Mediatek to generic so it can be used everywhere.
Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18163
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
054b870196