ARM: dts: imx6qdl-vicut1.dtsi: Fix node name backlight_led

This naming error slipped through, so now that a new backlight node has
been added with correct spelling, fix this one also.

Fixes: 98efa526 ("ARM: dts: imx6qdl-vicut1/vicutgo: Add backlight_led node")
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-vicut1.dtsi

@@ -28,7 +28,7 @@ backlight_lcd: backlight {
 		enable-gpios = <&gpio4 28 GPIO_ACTIVE_HIGH>;
 	};
 
-	backlight_led: backlight_led {
+	backlight_led: backlight-led {
 		compatible = "pwm-backlight";
 		pwms = <&pwm3 0 5000000 0>;
 		brightness-levels = <0 16 64 255>;