[PR] greenhills support: add the "__sync_synchronize" func impl [nuttx]

[via GitHub]

extinguish opened a new pull request, #13146:
URL: https://github.com/apache/nuttx/pull/13146

   ## Summary
   add ghs header file support using to fix the following link error:
   
    [elxr] (error #412) unresolved symbols: 
    __sync_synchronize  from libopenamp.a(io.o)
   
   ## Impact
   
   ## Testing
   
   


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