rtl838x_hw_stop() still uses the old prefix. Change it "rteth"
and make clear that this is a generic function for all targets.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/22421
Signed-off-by: Robert Marko <robimarko@gmail.com>