This will make it easier for users to specify that they want iSAC in
their codec factories, since they'll no longer have to worry about
choosing either the fix or the float implementation.
BUG=webrtc:8343
Change-Id: I5fb713710a8dd86162b5de73a2f0a851947f1411
Reviewed-on: https://webrtc-review.googlesource.com/6540
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20222}
