realtek: add rtl8231-aux to rtl931x.dtsi

The RTL8231 auxiliary controller is not defined in the rtl931x.dtsi.
Additionally the pinmux is configured at the wrong address. Fix
this.

Signed-off-by: Markus Stockhausen <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19776
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/realtek/dts/rtl931x.dtsi

@@ -210,25 +210,29 @@
 
 			status = "disabled";
 		};
+
+		mdio_aux: mdio-aux {
+			compatible = "realtek,rtl9310-aux-mdio";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			pinctrl-0 = <&pinmux_gpio_mdio_en>;
+			pinctrl-names = "default";
+
+			status = "disabled";
+		};
 	};
 
-	pinmux: pinmux@1b001358 {
+	pinmux@1b0007d4 {
 		compatible = "pinctrl-single";
-		reg = <0x1b001358 0x4>;
+		reg = <0x1b0007d4 0x4>;
 
 		pinctrl-single,bit-per-mux;
 		pinctrl-single,register-width = <32>;
 		pinctrl-single,function-mask = <0x1>;
 		#pinctrl-cells = <2>;
 
-		/* Enable GPIO6 and GPIO7, possibly unknown others */
-		pinmux_disable_jtag: disable_jtag {
-			pinctrl-single,bits = <0x0 0x0 0x8000>;
-		};
-
-		/* Controls GPIO0 */
-		pinmux_disable_sys_led: disable_sys_led {
-			pinctrl-single,bits = <0x0 0x0 0x100>;
+		pinmux_gpio_mdio_en: gpio-mdio-en {
+			pinctrl-single,bits = <0x0 0x100 0x100>;
 		};
 	};