boards: fix partition definitions

Ensure that Zephyr partition nodes are properly removed before
redefining them in device tree overlays for various Arduino boards.
Additionally:

- use a single slot for the Nicla Sense ME;
- correct partition sizes and addresses for the Arduino UNO Q;
- cleaner definition of the user sketch partition for the Nano Matter;
- fix removal of partition on the Giga.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

Author: pillo79

variants/arduino_giga_r1_stm32h747xx_m7/arduino_giga_r1_stm32h747xx_m7.overlay

@@ -340,10 +340,10 @@
 };
 
 
+/delete-node/ &slot0_partition;
+
 &flash0 {
 	partitions {
-		/delete-node/ slot0_partition;
-
 		slot0_partition: partition@40000 {
 			label = "image-0";
 			reg = <0x040000 0xa0000>;

variants/arduino_nano_matter_mgm240sd22vna/arduino_nano_matter_mgm240sd22vna.overlay

@@ -1,16 +1,5 @@
-&flash0 {
-	partitions {
-		compatible = "fixed-partitions";
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		/* Arduino user sketch partition */
-		user_sketch: partition@C4000 {
-			reg = <0x000C4000 0x000B8000>;
-			label = "user";
-		};
-	};
-};
+/* Arduino user sketch partition */
+user_sketch: &slot1_partition {};
 
 / {
 	zephyr,user {

variants/arduino_nicla_sense_me_nrf52832/arduino_nicla_sense_me_nrf52832.overlay

@@ -1,5 +1,15 @@
+/delete-node/ &slot0_partition;
+/delete-node/ &slot1_partition;
+/delete-node/ &scratch_partition;
+/delete-node/ &storage_partition;
+
 &flash0 {
 	partitions {
+		slot0_partition: partition@10000 {
+			label = "image-0";
+			reg = < 0x10000 0x60000 >;
+		};
+
 		user_sketch: partition@70000 {
 			label = "user";
 			reg = <0x070000 0x10000>;

variants/arduino_uno_q_stm32u585xx/arduino_uno_q_stm32u585xx.overlay

@@ -54,13 +54,28 @@
 };
 */
 
+/delete-node/ &slot0_partition;
+/delete-node/ &slot1_partition;
+/delete-node/ &scratch_partition;
+/delete-node/ &storage_partition;
+
 &flash0 {
 	partitions {
-		bootanimation: partition@90000 {
-			reg = <0x090000 DT_SIZE_K(64)>;
+		slot0_partition: partition@10000 {
+			label = "image-0";
+			reg = < 0x10000 DT_SIZE_K(768) >;
+		};
+
+		bootanimation: partition@d0000 {
+			reg = < 0xd0000 DT_SIZE_K(192) >;
 		};
-		user_sketch: partition@f0000 {
-			reg = <0x0F0000 DT_SIZE_K(64)>;
+
+		user_sketch: partition@100000 {
+			reg = < 0x100000 DT_SIZE_K(768) >;
+		};
+
+		storage_partition: partition@1c0000 {
+			reg = < 0x1c0000 DT_SIZE_K(256) >;
 		};
 	};
 };