am 08945576: Merge change I9ac0777e into eclair-mr2

Merge commit '089455760c05289c1315268a6cb896577ceebc64' into eclair-mr2-plus-aosp

* commit '089455760c05289c1315268a6cb896577ceebc64':
  Initial checkin of software AMR NB encoder based on PV source code.