boards: nrf54h20dk: Add secure storage partitions

Update the default memory map to include a `secure_storage_partition`,
which is divided into at most four subpartitions. These will be used to
configure UICR.SECURESTORAGE, if enabled.

Signed-off-by: Grzegorz Swiderski <[email protected]>

Author: SebastianBoe

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20-memory_map.dtsi

@@ -174,5 +174,34 @@
 		secondary_periphconf_partition: partition@1c0000 {
 			reg = <0x1c0000 DT_SIZE_K(8)>;
 		};
+
+		/* NB: A gap has been left here for future partitions */
+
+		/* 0x1fd000 was chosen for secure_storage_partition such that
+		 * there is no more space after secure_storage_partition.
+		 */
+		secure_storage_partition: partition@1fd000 {
+			compatible = "fixed-subpartitions";
+			reg = <0x1fd000 DT_SIZE_K(12)>;
+			ranges = <0x0 0x1fd000 0x3000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			cpuapp_crypto_partition: partition@0 {
+				reg = <0x0 DT_SIZE_K(4)>;
+			};
+
+			cpurad_crypto_partition: partition@1000 {
+				reg = <0x1000 DT_SIZE_K(4)>;
+			};
+
+			cpuapp_its_partition: partition@2000 {
+				reg = <0x2000 DT_SIZE_K(2)>;
+			};
+
+			cpurad_its_partition: partition@2800 {
+				reg = <0x2800 DT_SIZE_K(2)>;
+			};
+		};
 	};
 };