ARM: at91/dt: at91rm9200ek: enable RTC

Enable the RTC on the at91rm9200ek.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91rm9200ek.dts

@@ -77,6 +77,10 @@
 			dbgu: serial@fffff200 {
 				status = "okay";
 			};
+
+			rtc: rtc@fffffe00 {
+				status = "okay";
+			};
 		};
 
 		usb0: ohci@00300000 {