Upload: Support adjustment of debug commands for debug launch

This gives chance to adjust GDB commands MBED_UPLOAD_LAUNCH_COMMANDS
or MBED_UPLOAD_RESTART_COMMANDS for debug launch by implementing
mbed_adjust_upload_debug_commands cmake function.

Author: ccli8

tools/cmake/mbed_target_functions.cmake

@@ -169,6 +169,12 @@ function(mbed_set_post_build target)
         mbed_generate_map_file(${target})
     endif()
 
+    # Give chance to adjust MBED_UPLOAD_LAUNCH_COMMANDS or MBED_UPLOAD_RESTART_COMMANDS
+    # for debug launch
+    if(COMMAND mbed_adjust_upload_debug_commands)
+        mbed_adjust_upload_debug_commands(${target})
+    endif()
+
     mbed_generate_upload_target(${target})
     mbed_generate_ide_debug_configuration(${target})
 endfunction()