Fix creation of mbed-wifi target to top directory

The location where the 'mbed-wifi' target is created is now fixed to the
top directory. CMake commands e.g. add_custom_command are required to
invoke in the same directory as where the 'mbed-wifi' target is created.

Author: ccli8

connectivity/drivers/wifi/CMakeLists.txt

@@ -23,6 +23,9 @@ if("WICED" IN_LIST MBED_TARGET_LABELS)
 endif()
 
 if("STM" IN_LIST MBED_TARGET_LABELS)
+    if("EMW3080B" IN_LIST MBED_TARGET_LABELS)
+        create_mbed_wifi_target()
+    endif()
     add_subdirectory(TARGET_STM EXCLUDE_FROM_ALL)
 endif()
 

connectivity/drivers/wifi/TARGET_STM/CMakeLists.txt

@@ -2,6 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
 if("EMW3080B" IN_LIST MBED_TARGET_LABELS)
-    create_mbed_wifi_target()
     add_subdirectory(COMPONENT_EMW3080B EXCLUDE_FROM_ALL)
 endif()