[nrf noup] config: Remove nRF70 Wi-Fi FW patch DFU defaults

The nRF70 Wi-Fi firmware patch DFU feature has been removed from
sdk-nrf, including the NRF_WIFI_FW_PATCH_DFU Kconfig option. Remove the
default override for it here, which otherwise triggers a "defined
without a type" Kconfig error now that the option no longer exists.

Also drop the UPDATEABLE_IMAGE_NUMBER and DFU_MULTI_IMAGE_MAX_IMAGE_COUNT
overrides that accounted for the firmware patch as a separate updatable
and DFU image, as the patch is no longer an MCUboot image.

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

Author: krish2718

config/nrfconnect/chip-module/Kconfig.defaults

@@ -247,15 +247,8 @@ config BOOT_IMAGE_ACCESS_HOOKS
     default y if SOC_SERIES_NRF53
 
 config UPDATEABLE_IMAGE_NUMBER
-    default 3 if NRF_WIFI_PATCHES_EXT_FLASH_STORE
     default 2 if SOC_SERIES_NRF53
 
-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 L2 configuration
 # ==============================================================================