All Realtek drivers use ctrl (control) als the central driver
structure. Align that for the ethernet driver. Additionally
use the rteth prefix for the device independent structure
definition. Its current prefix "rtl838x_" is only confusing.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21476
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>