snippets: Add storing nRF70 patches in external flash

This adds both DTS and configuration overlays that enable to store nRF70
patches in external flash.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

CODEOWNERS

@@ -207,6 +207,7 @@ Kconfig*                                  @tejlmand
 /snippets/nrf91-modem-trace-uart/         @eivindj-nordic
 /snippets/tfm-enable-share-uart/          @nrfconnect/ncs-cia
 /snippets/nrf70-debug/                    @krish2718 @sachinthegreen
+/snippets/nrf70-fw-patch-ext-flash/       @krish2718 @sachinthegreen
 /subsys/audio_module/                     @koffes @alexsven @erikrobstad @rick1082 @gWacey
 /subsys/bluetooth/                        @alwa-nordic @jori-nordic @carlescufi @KAGA164
 /subsys/bluetooth/mesh/                   @ludvigsj

snippets/nrf70-fw-patch-ext-flash/fw-patch-ext-flash.overlay

@@ -0,0 +1,18 @@
+/* Copyright (c) 2023 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+&qspi {
+	mx25r64: mx25r6435f@0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		nrf70_fw_partition: partition@0 {
+			label = "nrf70_fw_partition";
+			reg = <0x0 DT_SIZE_K(128)>;
+		};
+	};
+	};
+};

snippets/nrf70-fw-patch-ext-flash/overlay-fw-patch-ext-flash.conf

@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2023 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+CONFIG_NRF_WIFI_PATCHES_EXT_FLASH_STORE=y
+CONFIG_NRF_WIFI_FW_FLASH_CHUNK_SIZE=8192

snippets/nrf70-fw-patch-ext-flash/snippet.yml

@@ -0,0 +1,4 @@
+name: nrf70-fw-patch-ext-flash
+append:
+  EXTRA_DTC_OVERLAY_FILE: fw-patch-ext-flash.overlay
+  EXTRA_CONF_FILE: overlay-fw-patch-ext-flash.conf