[nrf noup] Adapt Matter SDK to te WiFi FW patch on external flash

This commit sets the default kconfigs if the WiFi FW patch on
external flash is enabled.

Author: ArekBalysNordic

config/nrfconnect/chip-module/Kconfig.defaults

@@ -206,8 +206,15 @@ config BOOT_IMAGE_ACCESS_HOOKS
     default y if SOC_SERIES_NRF53X
 
 config UPDATEABLE_IMAGE_NUMBER
+    default 3 if NRF_WIFI_PATCHES_EXT_FLASH_STORE
     default 2 if SOC_SERIES_NRF53X
 
+config DFU_MULTI_IMAGE_MAX_IMAGE_COUNT
+    default 3 if NRF_WIFI_PATCHES_EXT_FLASH_STORE
+
+config NRF_WIFI_FW_PATCH_DFU
+    default y if NRF_WIFI_PATCHES_EXT_FLASH_STORE
+
 # ==============================================================================
 # OpenThread configuration
 # ==============================================================================