boards: beagle: pocketbeagle_2: a53: Enable watchdog

- Enable main_rti0 watchdog timr.
- Tested on PocketBeagle 2 with the samples/drivers/watchdog.

Signed-off-by: Ayush Singh <ayush@beagleboard.org>

Author: Ayush1325

boards/beagle/pocketbeagle_2/pocketbeagle_2_am62_a53-common.dtsi

@@ -18,6 +18,7 @@
 
 	aliases {
 		led0 = &led1;
+		watchdog0 = &main_rti0;
 	};
 
 	ddr0: memory@80000000 {
@@ -79,3 +80,7 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&main_rti0 {
+	status = "okay";
+};