arm64: dts: ti: Add reserved memory for watchdog

This patch adds a reserved memory for the TI AM65X platform watchdog
to reserve the specific info, triggering the watchdog reset in last
boot, to know if the board reboot is due to a watchdog reset.

Signed-off-by: Li Hua Qian <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vignesh Raghavendra <[e-mail]>

arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi

···
 			alignment = <0x1000>;
 			no-map;
 		};
+
+		/* To reserve the power-on(PON) reason for watchdog reset */
+		wdt_reset_memory_region: wdt-memory@a2200000 {
+			reg = <0x00 0xa2200000 0x00 0x1000>;
+			no-map;
+		};
 	};
 
 	leds {
···
 	memory-region = <&mcu_r5fss0_core1_dma_memory_region>,
 			<&mcu_r5fss0_core1_memory_region>;
 	mboxes = <&mailbox0_cluster1 &mbox_mcu_r5fss0_core1>;
+};
+
+&mcu_rti1 {
+	memory-region = <&wdt_reset_memory_region>;
 };
 
 &icssg0_mdio {