FreeSWITCH-FS-7447

Merge pull request #280 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:opus_asymmetric-fmtp to master

* commit 'fe29cc6885269f06c635bc652007da834465c7f9':
  mod_opus : asymmetric sample rates based on fmtp params (maxplaybackrate and sprop-maxcapturerate)