am e006e4d2: Merge changes Iae1913fb,I38dbefef into gingerbread

Merge commit 'e006e4d2c91c50795df0a02366b31610b4e97cb1' into gingerbread-plus-aosp

* commit 'e006e4d2c91c50795df0a02366b31610b4e97cb1':
  RTP: Enable GSM codec.
  RTP: Refactor out G711 codecs into another file.