ARM: dts: s5p: Fix DTC unit name warnings in SMDKv210 board

Fix following DTC warnings in SMDKv210 board:

Warning (unit_address_vs_reg): Node /soc/fimd@f8000000/display-timings/timing@0 has a unit name, but no reg property
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>

arch/arm/boot/dts/s5pv210-smdkv210.dts

@@ -197,7 +197,7 @@ &fimd {
 	display-timings {
 		native-mode = <&timing0>;
 
-		timing0: timing@0 {
+		timing0: timing {
 			/* 800x480@60Hz */
 			clock-frequency = <24373920>;
 			hactive = <800>;