The RTL930x have only 4 SMI busses (0-3) and the XGS1250 SFP port ist
directly managed. Remove the wrong configuration in the dts.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/16457
Signed-off-by: Robert Marko <robimarko@gmail.com>