realtek: rtl931x: Fix SDS field modifications

realtek: rtl931x: Fix SDS field modifications

A RTL930x function to read the value from an SDS register must not used on
an RTL931x SoC. Doing it with rtl930x_read_sds_phy() would corrupt the
written results when only parts of the bits are written.

Fixes: 7026084066fb ("realtek: Add SDS configuration routines for the RTL93XX platforms")
Signed-off-by: Harshal Gohel <hg@simonwunderlich.de>
Signed-off-by: Sharadanand Karanjkar <sk@simonwunderlich.de>
Link: https://github.com/openwrt/openwrt/pull/19603
Signed-off-by: Robert Marko <robimarko@gmail.com>