arm: dts: berlin2: add watchdog nodes

The Marvell Berlin BG2 has 3 watchdogs which are compatible with the
snps,dw-wdt driver sit in the sysmgr domain. This patch adds the
corresponding device tree nodes.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

arch/arm/boot/dts/berlin2.dtsi

@@ -435,6 +435,29 @@ apb@fc0000 {
 			ranges = <0 0xfc0000 0x10000>;
 			interrupt-parent = <&sic>;
 
+			wdt0: watchdog@1000 {
+				compatible = "snps,dw-wdt";
+				reg = <0x1000 0x100>;
+				clocks = <&refclk>;
+				interrupts = <0>;
+			};
+
+			wdt1: watchdog@2000 {
+				compatible = "snps,dw-wdt";
+				reg = <0x2000 0x100>;
+				clocks = <&refclk>;
+				interrupts = <1>;
+				status = "disabled";
+			};
+
+			wdt2: watchdog@3000 {
+				compatible = "snps,dw-wdt";
+				reg = <0x3000 0x100>;
+				clocks = <&refclk>;
+				interrupts = <2>;
+				status = "disabled";
+			};
+
 			sm_gpio1: gpio@5000 {
 				compatible = "snps,dw-apb-gpio";
 				reg = <0x5000 0x400>;