ARM: dts: imx51-babbage: Add PMIC RTC support

Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx51-babbage.dts

@@ -203,6 +203,7 @@
 		reg = <0>;
 		interrupt-parent = <&gpio1>;
 		interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
+		fsl,mc13xxx-uses-rtc;
 
 		regulators {
 			sw1_reg: sw1 {