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Since the value is overwritten by latter mixin, we should use
goma-rbe-prod-ats instead of specifying goma-rbe-prod and goma-ats.

Bug: 981433
Change-Id: I4f4ffd74f01a5c028e68c8a5c6e91506b6077917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763659Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689366}