[nrf fromlist] Revert "boards: nordic: Rearrange ram0x regions."

This reverts commit a53cb73.

Upstream PR #: 88121

Ref: NCSDK-32650

Signed-off-by: Tomasz Chyrowicz <[email protected]>

This reverts commit a53cb73.

Author: tomchy

boards/nordic/nrf54h20dk/nrf54h20dk_nrf54h20-memory_map.dtsi

@@ -7,44 +7,44 @@
 
 / {
 	reserved-memory {
-		cpurad_ram0x_region: memory@2f010000 {
+		cpuapp_ram0x_region: memory@2f010000 {
 			compatible = "nordic,owned-memory";
-			reg = <0x2f010000 DT_SIZE_K(4)>;
+			reg = <0x2f010000 DT_SIZE_K(260)>;
 			status = "disabled";
-			nordic,access = <NRF_OWNER_ID_RADIOCORE NRF_PERM_RWS>;
+			nordic,access = <NRF_OWNER_ID_APPLICATION NRF_PERM_RWS>;
 			#address-cells = <1>;
 			#size-cells = <1>;
-			ranges = <0x0 0x2f010000 0x1000>;
+			ranges = <0x0 0x2f010000 0x41000>;
 
-			cpusec_cpurad_ipc_shm: memory@0 {
+			cpusec_cpuapp_ipc_shm: memory@0 {
 				reg = <0x0 DT_SIZE_K(2)>;
 			};
 
-			cpurad_cpusec_ipc_shm: memory@800 {
+			cpuapp_cpusec_ipc_shm: memory@800 {
 				reg = <0x800 DT_SIZE_K(2)>;
 			};
+
+			cpuapp_data: memory@1000 {
+				reg = <0x1000 DT_SIZE_K(256)>;
+			};
 		};
 
-		cpuapp_ram0x_region: memory@2f011000 {
+		cpurad_ram0x_region: memory@2f051000 {
 			compatible = "nordic,owned-memory";
-			reg = <0x2f010000 DT_SIZE_K(260)>;
+			reg = <0x2f051000 DT_SIZE_K(4)>;
 			status = "disabled";
-			nordic,access = <NRF_OWNER_ID_APPLICATION NRF_PERM_RWS>;
+			nordic,access = <NRF_OWNER_ID_RADIOCORE NRF_PERM_RWS>;
 			#address-cells = <1>;
 			#size-cells = <1>;
-			ranges = <0x0 0x2f011000 0x41000>;
+			ranges = <0x0 0x2f051000 0x1000>;
 
-			cpusec_cpuapp_ipc_shm: memory@0 {
+			cpusec_cpurad_ipc_shm: memory@0 {
 				reg = <0x0 DT_SIZE_K(2)>;
 			};
 
-			cpuapp_cpusec_ipc_shm: memory@800 {
+			cpurad_cpusec_ipc_shm: memory@800 {
 				reg = <0x800 DT_SIZE_K(2)>;
 			};
-
-			cpuapp_data: memory@1000 {
-				reg = <0x1000 DT_SIZE_K(256)>;
-			};
 		};
 
 		etr_buf_ram0x_region: memory@2f0be000 {