ARM: dts: tango4: Import watchdog node

The device driver was added in v4.5 by commit dca536c4
("watchdog: add support for Sigma Designs SMP86xx/SMP87xx")
Signed-off-by: NMarc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/tango4-common.dtsi

@@ -91,6 +91,12 @@
 			reg-shift = <2>;
 		};
 
+		watchdog@1fd00 {
+			compatible = "sigma,smp8759-wdt";
+			reg = <0x1fd00 8>;
+			clocks = <&xtal>;
+		};
+
 		eth0: ethernet@26000 {
 			compatible = "sigma,smp8734-ethernet";
 			reg = <0x26000 0x800>;