rtldsa_930x_stp_get() and rtl930x_stp_set() use legacy table code.
Replace that with rtl_table_xxx() helpers.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/23037
Signed-off-by: Robert Marko <robimarko@gmail.com>