ARM: dts: imx: align LED node names with dtschema

The node names should be generic and DT schema expects certain pattern.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51-apf51dev.dts

@@ -63,7 +63,7 @@ user-key {
 	leds {
 		compatible = "gpio-leds";
 
-		user {
+		led-user {
 			label = "Heartbeat";
 			gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "heartbeat";

arch/arm/boot/dts/imx53-qsb-common.dtsi

@@ -71,7 +71,7 @@ leds {
 		pinctrl-names = "default";
 		pinctrl-0 = <&led_pin_gpio7_7>;
 
-		user {
+		led-user {
 			label = "Heartbeat";
 			gpios = <&gpio7 7 0>;
 			linux,default-trigger = "heartbeat";

arch/arm/boot/dts/imx6q-novena.dts

@@ -99,7 +99,7 @@ leds {
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_leds_novena>;
 
-		heartbeat {
+		led-heartbeat {
 			label = "novena:white:panel";
 			gpios = <&gpio1 21 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "default-on";

arch/arm/boot/dts/imx7d-zii-rmu2.dts

@@ -24,7 +24,7 @@ gpio-leds {
 		pinctrl-0 = <&pinctrl_leds_debug>;
 		pinctrl-names = "default";
 
-		debug {
+		led-debug {
 			label = "zii:green:debug1";
 			gpios = <&gpio2 8 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "heartbeat";

arch/arm/boot/dts/imx7d-zii-rpu2.dts

@@ -36,7 +36,7 @@ gpio-leds {
 		pinctrl-0 = <&pinctrl_leds_debug>;
 		pinctrl-names = "default";
 
-		debug {
+		led-debug {
 			label = "zii:green:debug1";
 			gpios = <&gpio2 8 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "heartbeat";