realtek: pcs: rtl930x: drop conditional SerDes setup

We can now setup most of the modes for RTL930x, recently XSGMII, QSGMII
and USXGMII-SX have been added. Thus we don't need a big list of allowed
modes anymore in SerDes setup. Drop this without replacement. Other
modes are still rejected in other places or will be rejected later with
a proper SerDes capability handling.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: openwrt/openwrt#21930
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Author: jonasjelonek

target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c

@@ -2960,21 +2960,6 @@ static int rtpcs_930x_setup_serdes(struct rtpcs_serdes *sds,
 {
 	int calib_tries = 0, ret;
 
-	/* Rely on setup from U-boot for some modes, e.g. USXGMII */
-	switch (hw_mode) {
-	case RTPCS_SDS_MODE_1000BASEX:
-	case RTPCS_SDS_MODE_SGMII:
-	case RTPCS_SDS_MODE_2500BASEX:
-	case RTPCS_SDS_MODE_10GBASER:
-	case RTPCS_SDS_MODE_USXGMII_10GSXGMII:
-	case RTPCS_SDS_MODE_USXGMII_10GQXGMII:
-	case RTPCS_SDS_MODE_QSGMII:
-	case RTPCS_SDS_MODE_XSGMII:
-		break;
-	default:
-		return 0;
-	}
-
 	/* Turn Off Serdes */
 	ret = rtpcs_930x_sds_set_mode(sds, RTPCS_SDS_MODE_OFF);
 	if (ret < 0)