m68k: dts: add watchdog node

Add watchdog node for the implemented mcf_wdt driver.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
Changes for v2:
- remove unnecessary big-endian property
Changes for v3:
- none
diff --git a/arch/m68k/dts/mcf5282.dtsi b/arch/m68k/dts/mcf5282.dtsi
index 883c0d0..640c1a3 100644
--- a/arch/m68k/dts/mcf5282.dtsi
+++ b/arch/m68k/dts/mcf5282.dtsi
@@ -23,6 +23,12 @@
 			ranges = <0x00000000 0x40000000 0x40000000>;
 			reg = <0x40000000 0x40000000>;
 
+			wdog0: watchdog@140000 {
+				compatible = "fsl,mcf5282-wdt";
+				reg = <0x140000 0x10>;
+				status = "disabled";
+			};
+
 			uart0: uart@200 {
 				compatible = "fsl,mcf-uart";
 				reg = <0x200 0x40>;