kernel: fix rtl8261n driver for realtek

kernel: fix rtl8261n driver for realtek

The RTL8261N driver does not work correctly on non-mediatek devices. Remove
some of the power controls for Realtek chips.

This assumes the network has been started by the bootloader already:
(rtk network on).

Co-authored-by: Sebastian Gottschall
- https://github.com/mirror/dd-wrt/commit/bf45143f03d40bf259d34bba2151aab46ee011f4
- https://github.com/mirror/dd-wrt/commit/2fb02a5745bb538124a7467b399930b5ca79e71d
- https://github.com/mirror/dd-wrt/commit/598a16a8d801869e09c033f8ca35534289d393cf
Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/19081
Signed-off-by: Robert Marko <robimarko@gmail.com>