arm64: dts: ti: k3-am68-sk-base-board: Fixup reference to phandles array

When referring to array of phandles, using <> to separate the array
entries is better notation as it makes potential errors with phandle and
cell arguments easier to catch. Fix the outliers to be consistent with
the rest of the usage.
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20230606182220.3661956-15-nm@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts

@@ -287,7 +287,7 @@ &main_sdhci1 {
 
 &mcu_cpsw {
 	pinctrl-names = "default";
-	pinctrl-0 = <&mcu_cpsw_pins_default &mcu_mdio_pins_default>;
+	pinctrl-0 = <&mcu_cpsw_pins_default>, <&mcu_mdio_pins_default>;
 };
 
 &davinci_mdio {