[PR] cmake/mkconfig: add support of set custom command options to config.h [nuttx]

[via GitHub]

anchao opened a new pull request, #15594:
URL: https://github.com/apache/nuttx/pull/15594

   ## Summary
   
   cmake/mkconfig: add support of set custom command options to config.h
   
   add support of set custom command options to config.h
   Use the -D parameter to pass the config to header file.
   NOTE which must start with the CONFIG_ prefix.
   eg:
   ```
     cmake -DCONFIG_AAA=1 -DCONFIG_BBB=1 -B build -DBOARD_CONFIG=sim/nsh -GNinja
   ```
   
   
   source file:
   ```
   #include <nuttx/config.h>
   
   int main(int argc, FAR char *argv[])
   {
   #ifdef CONFIG_AAA
     printf("Hello, World!! AAA: %d\n", CONFIG_AAA);
   #endif
   #ifdef CONFIG_BBB
     printf("Hello, World!! BBB: %d\n", CONFIG_BBB);
   #endif
     return 0;
   }
   ```
   
   output:
   ```
   $ ./build/nuttx 
   
   NuttShell (NSH) NuttX-10.4.0
   nsh> hello
   Hello, World!! AAA: 1
   Hello, World!! BBB: 1
   nsh> 
   ```
   
   Signed-off-by: chao an <anchao.arc...@bytedance.com>
   
   
   
   ## Impact
   
   N/A
   
   ## Testing
   
   ci-check


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