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.
Signed-off-by: xuxin19 <xuxin19@xiaomi.com>
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