Without it the WAN port won't be initialized properly.
Fixes: 8f578c15b3 ("rockchip: add NanoPi R2C support")
Reviewed-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
(cherry picked from commit d312f12b1a)