cmake: pm: Add a property for nRF70 firmware patch absolute address

nRF70 firmware patch hex file generation needs absolute address in the
external flash, and due to the way generator expressions are used it's
not easy to do this in the nRF70 driver cmake, so, add a property that
after calculation that can be used by nRF70 driver.

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

Author: krish2718

cmake/partition_manager.cmake

@@ -487,6 +487,33 @@ if (CONFIG_SECURE_BOOT AND CONFIG_BOOTLOADER_MCUBOOT)
     )
 endif()
 
+# Calculate absolute address for the wi-fi firmware patch location.
+if (CONFIG_WIFI_NRF700X AND CONFIG_NRF_WIFI_PATCHES_EXT_FLASH_STORE)
+  if(DEFINED ext_flash_dev)
+    get_filename_component(qspi_node ${ext_flash_dev} DIRECTORY)
+  else()
+    dt_nodelabel(qspi_node NODELABEL "qspi")
+  endif()
+  if(DEFINED qspi_node)
+    dt_reg_addr(xip_addr PATH ${qspi_node} NAME qspi_mm)
+    if(NOT DEFINED xip_addr)
+      message(WARNING "\
+      Could not find memory mapped address for XIP. Generated update hex files will \
+      not have the correct base address. Hence they can not be programmed directly \
+      to the external flash")
+    endif()
+  else()
+    set(xip_addr 0)
+  endif()
+
+  math(EXPR wifi_fw_abs_addr "${xip_addr} + ${PM_NRF70_WIFI_FW_OFFSET}")
+  set_property(
+    TARGET partition_manager
+    PROPERTY nrf70_wifi_fw_XIP_ABS_ADDR
+    ${wifi_fw_abs_addr}
+    )
+endif()
+
 if (is_dynamic_partition_in_domain)
   # We are being built as sub image.
   # Expose the generated partition manager configuration files to parent image.