[nrf fromlist] boards: nrf54h20dk: Add SUIT storage definition

Upstream PR: zephyrproject-rtos/zephyr#72810

Add a definition of SUIT storage, so there will be a common source of
the SUIT storage location for both SDFW and scripts generating SUIT
storage areas, assigned to local domains.

Signed-off-by: Tomasz Chyrowicz <tomasz.chyrowicz@nordicsemi.no>

dts/common/nordic/nrf54h20.dtsi

@@ -78,6 +78,10 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 
+		suit_storage_partition: memory@e1eb000 {
+			reg = <0xe1eb000 DT_SIZE_K(24)>;
+		};
+
 		cpurad_uicr_ext: memory@e1ff000 {
 			reg = <0xe1ff000 DT_SIZE_K(2)>;
 		};