powerpc/p1022ds: add a interrupt for rtc node

Add an external interrupt for rtc node.
Signed-off-by: NWang Dongsheng <dongsheng.wang@freescale.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/boot/dts/p1022ds.dtsi

@@ -148,6 +148,7 @@
 		rtc@68 {
 			compatible = "dallas,ds3232";
 			reg = <0x68>;
+			interrupts = <0x1 0x1 0 0>;
 		};
 		adt7461@4c {
 			compatible = "adi,adt7461";