ARM: at91/dt: at91sam9n12ek: enable RTC

Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9n12ek.dts

@@ -137,6 +137,10 @@
 			watchdog@fffffe40 {
 				status = "okay";
 			};
+
+			rtc@fffffeb0 {
+				status = "okay";
+			};
 		};
 
 		nand0: nand@40000000 {