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These builder def functions set Goma RBE backend by default:

ci.star:
- gpu_fyi_linux_builder()
- linux_builder()

try.star:
- gpu_linux_builder()
- linux_builder()

Bug: 1025325
Change-Id: Id013d72d11744a7192790fe1fa60c2b4e4dfb616
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933829Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718963}