realtek: rename smi-address dts property

realtek: rename smi-address dts property

The rtl9300,smi-address property was first developed for the RTL930x
targets. So it got a device specific prefix. Nowadays it is used for
RTL931x targets too. Convert it to our gerneric realtek prefix.

find ./realtek -type f -exec sed -i 's/rtl9300,smi-address/realtek,smi-address/g' {} +

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21343
Signed-off-by: Robert Marko <robimarko@gmail.com>