boards: st: fix STM32L0 boards DTS files coding style

Fix board DTS coding style issues to prevent they spread when a	new
board is introduced and used this DTS as example start point.

Issues addressed from Zephyr devicetree style guidelines [1]:
- Insert a single empty line to separate nodes at the same hierarchy level.

No functional change.

Link: https://docs.zephyrproject.org/latest/contribute/style/devicetree.html [1]
Signed-off-by: Etienne Carriere <[email protected]>

Author: etienne-lms

boards/st/b_l072z_lrwan1/b_l072z_lrwan1.dts

@@ -22,18 +22,22 @@
 
 	leds {
 		compatible = "gpio-leds";
+
 		green_led_0: led_0 {
 			gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
 			label = "Green LED 1";
 		};
+
 		green_led_1: led_1 {
 			gpios = <&gpiob 5 GPIO_ACTIVE_HIGH>;
 			label = "Green LED 2";
 		};
+
 		blue_led: led_2 {
 			gpios = <&gpiob 6 GPIO_ACTIVE_HIGH>;
 			label = "Blue LED";
 		};
+
 		red_led: led_3 {
 			gpios = <&gpiob 7 GPIO_ACTIVE_HIGH>;
 			label = "Red LED";
@@ -42,6 +46,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button_0 {
 			label = "Push button switch";
 			gpios = <&gpiob 2 GPIO_ACTIVE_LOW>;

boards/st/nucleo_l011k4/nucleo_l011k4.dts

@@ -22,6 +22,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_2: led_2 {
 			gpios = <&gpiob 3 GPIO_ACTIVE_HIGH>;
 			label = "User LD2";
@@ -30,6 +31,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioa 12 GPIO_ACTIVE_LOW>;

boards/st/nucleo_l031k6/nucleo_l031k6.dts

@@ -22,6 +22,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_2: led_2 {
 			gpios = <&gpiob 3 GPIO_ACTIVE_HIGH>;
 			label = "User LD2";

boards/st/nucleo_l053r8/nucleo_l053r8.dts

@@ -24,6 +24,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_2: led_2 {
 			gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
 			label = "User LD2";
@@ -32,6 +33,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;

boards/st/nucleo_l073rz/nucleo_l073rz.dts

@@ -25,6 +25,7 @@
 
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_2: led_2 {
 			gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>;
 			label = "User LD2";
@@ -33,6 +34,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;