powerpc/83xx: Add missing cell-index to dma-channel device nodes

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/mpc8378_rdb.dts b/arch/powerpc/boot/dts/mpc8378_rdb.dts
index 34a7f2f..b3e3bd7 100644
--- a/arch/powerpc/boot/dts/mpc8378_rdb.dts
+++ b/arch/powerpc/boot/dts/mpc8378_rdb.dts
@@ -155,24 +155,28 @@
 			dma-channel@0 {
 				compatible = "fsl,mpc8378-dma-channel", "fsl,elo-dma-channel";
 				reg = <0 0x80>;
+				cell-index = <0>;
 				interrupt-parent = <&ipic>;
 				interrupts = <71 8>;
 			};
 			dma-channel@80 {
 				compatible = "fsl,mpc8378-dma-channel", "fsl,elo-dma-channel";
 				reg = <0x80 0x80>;
+				cell-index = <1>;
 				interrupt-parent = <&ipic>;
 				interrupts = <71 8>;
 			};
 			dma-channel@100 {
 				compatible = "fsl,mpc8378-dma-channel", "fsl,elo-dma-channel";
 				reg = <0x100 0x80>;
+				cell-index = <2>;
 				interrupt-parent = <&ipic>;
 				interrupts = <71 8>;
 			};
 			dma-channel@180 {
 				compatible = "fsl,mpc8378-dma-channel", "fsl,elo-dma-channel";
 				reg = <0x180 0x28>;
+				cell-index = <3>;
 				interrupt-parent = <&ipic>;
 				interrupts = <71 8>;
 			};