Set the appropriate cpu_port value based on the use of realtek,extif0 to extif2
instead of the additional cpu_port parameter.
Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/15033
Signed-off-by: Robert Marko <robimarko@gmail.com>