siemens: imx8-capricorn.dtsi: add wdt device

add wdt device

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/arm/dts/imx8-capricorn.dtsi b/arch/arm/dts/imx8-capricorn.dtsi
index 4918bf8..3734a9d 100644
--- a/arch/arm/dts/imx8-capricorn.dtsi
+++ b/arch/arm/dts/imx8-capricorn.dtsi
@@ -17,6 +17,11 @@
 		stdout-path = &lpuart2;
 	};
 
+	/* create device for u-boot wdt command */
+	scu-wdt {
+		compatible = "siemens,scu-wdt";
+	};
+
 };
 
 &iomuxc {