powerpc/p5040: fix dtb build warning of p5040ds.dtb

Device node adt7461 was wrongly added in p5040ds.dts, it should be added
into i2c instead of localbus, when build p5040ds.dtb, a warning will dump:

Warning (reg_format): "reg" property in
/localbus@ffe124000/nand@2,0/adt7461@4c has invalid length (4 bytes)
(#address-cells == 1, #size-cells == 1)

This was introduced by:

commit ea6b1ba692bcb5f6e39f409a78cf8b04fdf23baa
Author: Jia Hongtao <B38951@freescale.com>
Date:   Tue Aug 28 10:00:55 2012 +0800

    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: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/p5040ds.dts

@@ -95,6 +95,10 @@ rtc@68 {
 				reg = <0x68>;
 				interrupts = <0x1 0x1 0 0>;
 			};
+			adt7461@4c {
+				compatible = "adi,adt7461";
+				reg = <0x4c>;
+			};
 		};
 	};
 
@@ -146,10 +150,6 @@ partition@1f000000 {
 				label = "NAND Writable User area";
 				reg = <0x1f000000 0x01000000>;
 			};
-			adt7461@4c {
-				compatible = "adi,adt7461";
-				reg = <0x4c>;
-			};
 		};
 
 		board-control@3,0 {