ARM: dts: imx6ul-pico-hobbit: Make the child led nodes standard

Use the same child led node and label name as used in the
imx7d-pico-hobbit board.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul-pico-hobbit.dts

@@ -15,8 +15,8 @@ / {
 	leds {
 		compatible = "gpio-leds";
 
-		hobbitled {
-			label = "hobbitled";
+		led {
+			label = "gpio-led";
 			gpios = <&gpio1 29 GPIO_ACTIVE_LOW>;
 		};
 	};