powerpc: add adt7461 thermal monitor support to applicable boards

Add thermal monitor support to following boards:
P1022DS, MPC8536DS, P2041RDB, P3041DS, P4080DS, P5020DS, P5040DS

Signed-off-by: Jia Hongtao <B38951@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/boot/dts/p5020ds.dts b/arch/powerpc/boot/dts/p5020ds.dts
index 27c07ed..2869fea 100644
--- a/arch/powerpc/boot/dts/p5020ds.dts
+++ b/arch/powerpc/boot/dts/p5020ds.dts
@@ -98,6 +98,10 @@
 				reg = <0x68>;
 				interrupts = <0x1 0x1 0 0>;
 			};
+			adt7461@4c {
+				compatible = "adi,adt7461";
+				reg = <0x4c>;
+			};
 		};
 	};