realtek: dsa,pcs: rtl930x: Disable SerDes patching for 10G-QXGMII

realtek: dsa,pcs: rtl930x: Disable SerDes patching for 10G-QXGMII

The code to add bootstrapping for 10G-QXGMII on RTL930X broke the only
devices which are using 10G-QXGMII on RTL930X (Plasma Cloud PSX8+PSX10) in
OpenWrt. It is currently unknown what other changes are pending to get this
correctly working. But both the `rtpcs_930x_sds_usxgmii_config()` call and
the write of the "magic" SerDes values in the patching process break the
SerDes connected to the RTL8224 PHYs.

The Plasma Cloud PSX8+PSX10 devices get their RTL8224 and the 10G-QXGMII
SerDes bootstrapped directly by u-boot.

Fixes: dca20f91ea12 ("realtek: add serdes patch for 10G_QXGMII")
Signed-off-by: Sven Eckelmann <se@simonwunderlich.de>
Link: https://github.com/openwrt/openwrt/pull/20588
Signed-off-by: Robert Marko <robimarko@gmail.com>