ARM: dts: imx25-pdk: native-mode is part of display-timings

Move the native-mode property inside the display-timings node.

According to
Documentation/devicetree/bindings/display/panel/display-timing.txt.
native-mode is a property of the display-timings node.

If it's located outside of display-timings, the native-mode setting is
ignored and the first display timing is used (which is a problem only if
someone adds another display timing).

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx25-pdk.dts

@@ -76,8 +76,8 @@
 		bits-per-pixel = <16>;
 		fsl,pcr = <0xfa208b80>;
 		bus-width = <18>;
-		native-mode = <&wvga_timings>;
 		display-timings {
+			native-mode = <&wvga_timings>;
 			wvga_timings: 640x480 {
 				hactive = <640>;
 				vactive = <480>;