Corrected the handling of saturated echoes inside AEC3
Corrected the handling of saturated echoes inside AEC3

Bug: webrtc:8747
Change-Id: I644e00c5cc73c8c7b5893725fa15fc018de3cc91
Reviewed-on: https://webrtc-review.googlesource.com/39508
Commit-Queue: Per Åhgren <3616c2c8a2c30a769c5419f89b4a810ea6e2f079@webrtc.org>
Reviewed-by: Gustaf Ullberg <3619ad972adf2eeb42172b0d9b4d612d59d226c7@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#21620}
ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc