This enables the bit exactness tests for the audio level controller. Additionally, some expected test values are updated. Bug: webrtc:8309 Change-Id: Ia73f2a16aea4b3e926d70d8b4b8e5d5d801833c7 Reviewed-on: https://webrtc-review.googlesource.com/4426 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20102}