[PR] {BP-10870} fixedmath: add abs and sign operations [nuttx]

[via GitHub]

jerpelea opened a new pull request, #10949:
URL: https://github.com/apache/nuttx/pull/10949

   ## Summary
       fixedmath: add abs and sign operations
       libdsp/lib_observe: fix typo and use b16sign()
       libds/lib_misc: use b16abs()
   
   ## Impact
   RELEASE
   
   ## Testing
   RC1
   


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