Remove obsolete valgrind suppression.
Remove obsolete valgrind suppression.

The code which triggered the memcheck failure is gone.

Bug: webrtc:5989
Change-Id: I35decfae1af4e988724ababa58c41fca7a2c4a67
Reviewed-on: https://webrtc-review.googlesource.com/69261
Reviewed-by: Karl Wiberg <2c708eb0a58047bf403399f50b3da33ffd2dd444@webrtc.org>
Commit-Queue: Fredrik Solenberg <a86c06127c44de4932e34935a0755af178aabab6@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#22821}
ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc