snippets: nrf70-wifi: Fix 54H memory map

Redo the memory map to accommodate CPURAD slot0, this is essential for
combo build.

Also, apply the memory map to both CPUAPP and CPURAD to fix the memory
corruption issues if they see different memory maps, rename the file to
reflect the shared nature.

Fix SHEL-3743.

Signed-off-by: Chaitanya Tata <[email protected]>

Author: krish2718

snippets/nrf70-wifi/nrf54h20_cpuapp.overlay

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+/* Redo the Flash partitions */
+&mram1x {
+	/delete-node/ partitions;
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		cpuapp_boot_partition: partition@30000 {
+			reg = <0x30000 DT_SIZE_K(64)>;
+		};
+
+		slot0_partition: cpuapp_slot0_partition: partition@40000 {
+			reg = <0x40000 DT_SIZE_K(1076)>;
+		};
+
+		cpurad_slot0_partition: partition@14d000 {
+			reg = <0x14d000 DT_SIZE_K(328)>;
+		};
+
+		cpuppr_code_partition: partition@19f000 {
+			reg = <0x19f000 DT_SIZE_K(64)>;
+		};
+
+		cpuflpr_code_partition: partition@1af000 {
+			reg = <0x1af000 DT_SIZE_K(48)>;
+		};
+
+		storage_partition: partition@1bb000 {
+			reg = <0x1bb000 DT_SIZE_K(40)>;
+		};
+
+		periphconf_partition: partition@1c5000 {
+			reg = <0x1c5000 DT_SIZE_K(8)>;
+		};
+	};
+};
+
+/* Conflict with Wi-Fi SPI */
+&uart135 {
+	status = "disabled";
+};

snippets/nrf70-wifi/nrf54h20_cpurad.overlay

@@ -7,11 +7,11 @@ boards:
   nrf54h20dk/nrf54h20/cpuapp:
     append:
       EXTRA_CONF_FILE: nrf54h20_cpuapp.conf
-      EXTRA_DTC_OVERLAY_FILE: nrf54h20_cpuapp.overlay
+      EXTRA_DTC_OVERLAY_FILE: nrf54h20_wifi_memory_map.overlay
   nrf54h20dk/nrf54h20/cpurad:
     append:
       EXTRA_CONF_FILE: nrf54h20_cpurad.conf
-      EXTRA_DTC_OVERLAY_FILE: nrf54h20_cpurad.overlay
+      EXTRA_DTC_OVERLAY_FILE: nrf54h20_wifi_memory_map.overlay
   nrf54l15dk/nrf54l15/cpuapp:
     append:
       EXTRA_CONF_FILE: nrf54l15_cpuapp.conf