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/p2041rdb.dts b/arch/powerpc/boot/dts/p2041rdb.dts
index baab034..d97ad74 100644
--- a/arch/powerpc/boot/dts/p2041rdb.dts
+++ b/arch/powerpc/boot/dts/p2041rdb.dts
@@ -94,6 +94,10 @@
 				compatible = "pericom,pt7c4338";
 				reg = <0x68>;
 			};
+			adt7461@4c {
+				compatible = "adi,adt7461";
+				reg = <0x4c>;
+			};
 		};
 
 		i2c@118100 {