boards: st: fix STM32L5 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]:
- Indent with tabs.
- 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 <etienne.carriere@st.com>

boards/st/nucleo_l552ze_q/nucleo_l552ze_q-common.dtsi

@@ -12,14 +12,17 @@
 / {
 	leds: leds {
 		compatible = "gpio-leds";
+
 		green_led_1: led_1 {
 			gpios = <&gpioc 7 GPIO_ACTIVE_HIGH>;
 			label = "User LD1";
 		};
+
 		blue_led_1: led_2 {
 			gpios = <&gpiob 7 GPIO_ACTIVE_HIGH>;
 			label = "User LD2";
 		};
+
 		red_led_1: led_3 {
 			gpios = <&gpioa 9 GPIO_ACTIVE_HIGH>;
 			label = "User LD3";
@@ -28,6 +31,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;

boards/st/nucleo_l552ze_q/nucleo_l552ze_q_stm32l552xx_ns.dts

@@ -29,7 +29,6 @@
 };
 
 &flash0 {
-
 	partitions {
 		compatible = "fixed-partitions";
 		#address-cells = <1>;
@@ -47,21 +46,25 @@
 			reg = <0x00000000 DT_SIZE_K(80)>;
 			read-only;
 		};
+
 		/* Secure image primary slot */
 		slot0_partition: partition@14000 {
 			label = "image-0";
 			reg = <0x00014000 DT_SIZE_K(180)>;
 		};
+
 		/* Non-secure image primary slot */
 		slot0_ns_partition: partition@41000 {
 			label = "image-0-nonsecure";
 			reg = <0x00041000 DT_SIZE_K(36)>;
 		};
+
 		/* Secure image secondary slot */
 		slot1_partition: partition@4a000 {
 			label = "image-1";
 			reg = <0x0004a000 DT_SIZE_K(180)>;
 		};
+
 		/* Non-secure image secondary slot */
 		slot1_ns_partition: partition@77000 {
 			label = "image-1-nonsecure";

boards/st/stm32l562e_dk/stm32l562e_dk.dts

@@ -51,7 +51,7 @@
 
 		/* 2KB at the end of 512KB flash is set for storage */
 		storage_partition: partition@7f800 {
-			   reg = <0x0007f800 DT_SIZE_K(2)>;
-		   };
+			reg = <0x0007f800 DT_SIZE_K(2)>;
+		};
 	};
 };

boards/st/stm32l562e_dk/stm32l562e_dk_common.dtsi

@@ -14,10 +14,12 @@
 / {
 	leds {
 		compatible = "gpio-leds";
+
 		red_led_9: led_9 {
 			gpios = <&gpiod 3 GPIO_ACTIVE_LOW>;
 			label = "User LD9";
 		};
+
 		green_led_10: led_10 {
 			gpios = <&gpiog 12 GPIO_ACTIVE_LOW>;
 			label = "User LD10";
@@ -26,6 +28,7 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
+
 		user_button: button {
 			label = "User";
 			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
@@ -90,6 +93,7 @@
 				register-select-pin = <0>;
 				#address-cells = <1>;
 				#size-cells = <0>;
+
 				st7789v: lcd-panel@0 {
 					compatible = "sitronix,st7789v";
 					reg = <0>;

boards/st/stm32l562e_dk/stm32l562e_dk_stm32l562xx_ns.dts

@@ -45,16 +45,19 @@
 			reg = <0x00000000 DT_SIZE_K(100)>;
 			read-only;
 		};
+
 		/* Secure image primary slot */
 		slot0_partition: partition@19000 {
 			reg = <0x00019000 DT_SIZE_K(240)>;
 		};
+
 		/* Non-secure image primary slot */
 		slot1_ns_partition: partition@55000 {
 			reg = <0x00055000 DT_SIZE_K(168)>;
 		};
+
 		/* 4KB at the end of 512KB flash is set for storage */
-		 storage_partition: partition@7f000 {
+		storage_partition: partition@7f000 {
 			reg = <0x0007f000 DT_SIZE_K(4)>;
 		};
 	};