[maintenance] Remove empty jbm_pcmdsp_fifo files in lib_dec

Archit Tamarapurequested to merge
remove-empty-jbm-file into main
  • Related issues: N/A
  • Requested reviewers: @multrus

Reason why this change is needed

  • The compiler reports ranlib: warning: 'liblib_dec.a(jbm_pcmdsp_fifo.c.o)' has no symbols

Description of the change

  • Remove the empty files

Affected operating points

  • N/A

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