boards: stm: nucleo_h723zg: added flash partition to work with mcuboot

Added code partitioning for ST Nucleo H723ZG board.
Defined flash partitions including "mcuboot," "image-0,", "image-1"
and "image-scratch".

Signed-off-by: Thomas Bouston <[email protected]>

boards/st/nucleo_h723zg/nucleo_h723zg.dts

@@ -24,6 +24,7 @@
 		zephyr,dtcm = &dtcm;
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
 	};
 
 	leds: leds {
@@ -190,3 +191,36 @@ zephyr_udc0: &usbotg_hs {
 &rng {
 	status = "okay";
 };
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* 128KB for bootloader */
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 DT_SIZE_K(128)>;
+			read-only;
+		};
+
+		/* primary application image slot: 384KB */
+		slot0_partition: partition@20000 {
+			label = "image-0";
+			reg = <0x00020000 DT_SIZE_K(384)>;
+		};
+
+		/* secondary application image slot: 384KB */
+		slot1_partition: partition@80000 {
+			label = "image-1";
+			reg = <0x00080000 DT_SIZE_K(384)>;
+		};
+
+		/* swap slot: 128KB */
+		scratch_partition: partition@e0000 {
+			label = "image-scratch";
+			reg = <0x000e0000 DT_SIZE_K(128)>;
+		};
+	};
+};