arm64: dts: ti: k3-am62p5-sk: Enable CPSW MDIO node

Enable the CPSW MDIO node, and link the pinctrl information to enable
ethernet on SK-AM62P.

Ethernet was unintentally broken on this board, even though these nodes
were already present, as enabling them was missed in the original
patch.

Fixes: c00504ea ("arm64: dts: ti: k3-am62p5-sk: Updates for SK EVM")
Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Link: https://lore.kernel.org/r/20240201-am62p_cpsw_mdio-v1-1-05f758300f6e@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-am62p5-sk.dts

@@ -445,6 +445,10 @@ &cpsw_port2 {
 };
 
 &cpsw3g_mdio {
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_mdio1_pins_default>;
+	status = "okay";
+
 	cpsw3g_phy0: ethernet-phy@0 {
 		reg = <0>;
 		ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;