dt: bcm6858: add watchdog

This commit add watchdog and sysreset watchdog
in the bcm6858 device tree.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/arch/arm/dts/bcm6858.dtsi b/arch/arm/dts/bcm6858.dtsi
index d78d34d..23b80c6 100644
--- a/arch/arm/dts/bcm6858.dtsi
+++ b/arch/arm/dts/bcm6858.dtsi
@@ -81,5 +81,22 @@
 
 			status = "disabled";
 		};
+
+		wdt1: watchdog@ff802780 {
+			compatible = "brcm,bcm6345-wdt";
+			reg = <0x0 0xff802780 0x0 0x14>;
+			clocks = <&periph_osc>;
+		};
+
+		wdt2: watchdog@ff8027c0 {
+			compatible = "brcm,bcm6345-wdt";
+			reg = <0x0 0xff8027c0 0x0 0x14>;
+			clocks = <&periph_osc>;
+		};
+
+		wdt-reboot {
+			compatible = "wdt-reboot";
+			wdt = <&wdt1>;
+		};
 	};
 };