[POWERPC] Fix the mpc8641_hpcn.dts file.

Add 'linux,phandle' entry to i8259@4d0 node.
Signed-off-by: NZhang Wei <wei.zhang@freescale.com>
Signed-off-by: NJon Loeliger <jdl@freescale.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/boot/dts/mpc8641_hpcn.dts

@@ -293,6 +293,7 @@
 				f800 0 0 4 4d0 0 0
 				>;
 			i8259@4d0 {
+				linux,phandle = <4d0>;
 				clock-frequency = <0>;
 				interrupt-controller;
 				device_type = "interrupt-controller";