ARM: at91/dts: add at91sam9_wdt driver to at91sam926x, at91sam9g45

Tested on an at91sam9260 board (evk-pro3).

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9260.dtsi

@@ -246,6 +246,12 @@
 					trigger-external;
 				};
 			};
+
+			watchdog@fffffd40 {
+				compatible = "atmel,at91sam9260-wdt";
+				reg = <0xfffffd40 0x10>;
+				status = "disabled";
+			};
 		};
 
 		nand0: nand@40000000 {