[PR] cmake:bugfix kconfig menu in cmake cannot be generated recursively [nuttx]

[via GitHub]

xuxin930 opened a new pull request, #14756:
URL: https://github.com/apache/nuttx/pull/14756

   ## Summary
   
   the ${MENUCONFIG} file in the output directory is enough, as invoking 
nuttx_generate_kconfig() will generate this file in the output directory.
   Since we are collecting these files recursively,
   the nuttx_generate_kconfig() function of the parent directory will be called 
after all the subdirectories' nuttx_generate_kconfig() functions have been 
invoked.
   
   ## Impact
   
   This will correctly handle the situation where multiple directories need to 
generate kconfig menus.
   
   ## Testing
   
   creating a multi-level directory scenario
   
   ```
   # apps/dir1/
   nuttx_add_subdirectory()
   
   nuttx_generate_kconfig(MENUDESC "Level1")
   
   # apps/dir1/dir2
   nuttx_add_subdirectory()
   
   nuttx_generate_kconfig(MENUDESC "Level2")
   
   ```
   
   ```
   cmake -B build -DBOARD_CONFIG=nrf52832-dk:mcuboot_app -GNinja
   
   cmake --build build -t menuconfig
   ```
   
   The test results are normal and enter the multi-level menu
   
   


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