APM: limit native sample rate to 16kHz on mobile.

Required by AECM which assert-fails on higher sample rates.

BUG=3259
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/21369005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6002 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed