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Tricium service will reject the config if the "platform" for the
definition and selection don't match -- but in fact the platform
field is not important anymore, since platform is actually determined
by the builder config. It doesn't make any difference whether we
specify UBUNTU or LINUX, so just unify it to one.

Bug: 1105239
Change-Id: I8822957fa34e9e5afaa06a687cdeed50614aa087
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530749
Auto-Submit: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825986}