arm64: dts: marvell: enable AP806 watchdog

This watchdog is ARM SBSA generic watchdog.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm64/boot/dts/marvell/armada-ap806.dtsi

@@ -241,6 +241,12 @@ uart1: serial@512100 {
 
 			};
 
+			watchdog: watchdog@600000 {
+				compatible = "arm,sbsa-gwdt";
+				reg = <0x610000 0x1000>, <0x600000 0x1000>;
+				interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
+			};
+
 			ap_sdhci0: sdhci@6e0000 {
 				compatible = "marvell,armada-ap806-sdhci";
 				reg = <0x6e0000 0x300>;