Disable AudioCoding tests on ios
Disable AudioCoding tests on ios

BUG=webrtc:7057
TBR=minyue@webrtc.org
NOTRY=true

Review-Url: https://codereview.webrtc.org/2721323002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16932}

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