arm64: dts: ti: iot2050: Configure r5f cluster on basic variant in split mode

Lockstep mode is not supported here. So turn it off to avoid warnings
during startup.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/3a241e50-80a3-992a-2445-345c629d7895@siemens.com

arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dts

@@ -59,3 +59,8 @@ &main_uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart0_pins_default>;
 };
+
+&mcu_r5fss0 {
+	/* lock-step mode not supported on this board */
+	ti,cluster-mode = <0>;
+};