Revert of CQ: Remove ARM64 trybots until toolchain issues are resolved. (patchset #1 id:1 of https://codereview.webrtc.org/2776393005/ )
Revert of CQ: Remove ARM64 trybots until toolchain issues are resolved. (patchset #1 id:1 of https://codereview.webrtc.org/2776393005/ )

Reason for revert:
These bots are now fully functional

Original issue's description:
> CQ: Remove ARM64 trybots until toolchain issues are resolved.
>
> BUG=webrtc:7024
> TBR=oprypin@webrtc.org
>
> Review-Url: https://codereview.webrtc.org/2776393005 .
> Cr-Commit-Position: refs/heads/master@{#17447}
> Committed: https://chromium.googlesource.com/external/webrtc/+/2103f8e59bf90175c775b285803b383eb0782876

TBR=oprypin@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7024

Review-Url: https://codereview.webrtc.org/2783003002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#17455}

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