GitLab

* roll ios14-sdk-simulator to build with 12a8179i_audio
* ios14-beta and ios14-sdk to run tests with 12a8179i_audio

git grep -l '12a6163b' | xargs sed -i '' -e 's/12a6163b/12a8179i_audio/g'

Tested with:
  led get-builder luci.chromium.try:ios14-sdk-simulator | \
  led edit -p 'xcode_build_version="12a8179i_audio"' | \
  led edit-cr-cl http://crrev.com/c/2340705 | \
  led launch

Bug: 1112941
Change-Id: I64c0beea00c554aa7c1c8cfa2b33383cd3e11493
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340705Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795634}