realtek: make use of serdes helper for Netgear GS310TP v1

Use the new INTERNAL_PHY_SDS() helper to describe the SFP ports. With
this change the driver now knows that ports 24/26 are driven by serdes
4/5.

For the RTL838x devices this is currently only an additional information
for the mdio bus. It is not evaluated further because everything is
hardcoded.

REMARK! The original commit c829bc1f2c3c47e2 ("realtek: Add support for
Netgear S350 series switches GS308T and GS310TP") says that the SFP
ports are untested. Looking at device internal pictures from
https://techinfodepot.shoutwiki.com/wiki/Netgear_GS310TP there are no
external phys for the SFP ports. So fix port description.

Signed-off-by: Markus Stockhausen <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18851
Signed-off-by: Robert Marko <[email protected]>

target/linux/realtek/dts/rtl8380_netgear_gs310tp-v1.dts

@@ -50,13 +50,13 @@
 };
 
 &mdio {
-	INTERNAL_PHY(24)
-	INTERNAL_PHY(26)
+	INTERNAL_PHY_SDS(24, 4)
+	INTERNAL_PHY_SDS(26, 5)
 };
 
 &switch0 {
 	ports {
-		SWITCH_SFP_PORT(24, 9, rgmii-id)
-		SWITCH_SFP_PORT(26, 10, rgmii-id)
+		SWITCH_SFP_PORT(24, 9, 1000base-x)
+		SWITCH_SFP_PORT(26, 10, 1000base-x)
 	};
 };